/**
 * term.js - an xterm emulator
 * Copyright (c) 2012-2013, Christopher Jeffrey (MIT License)
 * https://github.com/chjj/term.js
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * Originally forked from (with the author's permission):
 *   Fabrice Bellard's javascript vt100 for jslinux:
 *   http://bellard.org/jslinux/
 *   Copyright (c) 2011 Fabrice Bellard
 *   The original design remains. The terminal itself
 *   has been extended to include xterm CSI codes, among
 *   other features.
 */

;(function() {

    /**
     * Terminal Emulation References:
     *   http://vt100.net/
     *   http://invisible-island.net/xterm/ctlseqs/ctlseqs.txt
     *   http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
     *   http://invisible-island.net/vttest/
     *   http://www.inwap.com/pdp10/ansicode.txt
     *   http://linux.die.net/man/4/console_codes
     *   http://linux.die.net/man/7/urxvt
     */

    'use strict';

    /**
     * Shared
     */

    var window = this;

    /**
     * EventEmitter
     */

    function EventEmitter() {
        this._events = this._events || {};
    }

    EventEmitter.prototype.addListener = function(type, listener) {
        this._events[type] = this._events[type] || [];
        this._events[type].push(listener);
    };

    EventEmitter.prototype.on = EventEmitter.prototype.addListener;

    EventEmitter.prototype.removeListener = function(type, listener) {
        if (!this._events[type]) return;

        var obj = this._events[type]
            , i = obj.length;

        while (i--) {
            if (obj[i] === listener || obj[i].listener === listener) {
                obj.splice(i, 1);
                return;
            }
        }
    };

    EventEmitter.prototype.off = EventEmitter.prototype.removeListener;

    EventEmitter.prototype.removeAllListeners = function(type) {
        if (this._events[type]) delete this._events[type];
    };

    EventEmitter.prototype.once = function(type, listener) {
        function on() {
            var args = Array.prototype.slice.call(arguments);
            this.removeListener(type, on);
            return listener.apply(this, args);
        }
        on.listener = listener;
        return this.on(type, on);
    };

    EventEmitter.prototype.emit = function(type) {
        if (!this._events[type]) return;

        var args = Array.prototype.slice.call(arguments, 1)
            , obj = this._events[type]
            , l = obj.length
            , i = 0;

        for (; i < l; i++) {
            obj[i].apply(this, args);
        }
    };

    EventEmitter.prototype.listeners = function(type) {
        return this._events[type] = this._events[type] || [];
    };

    /**
     * States
     */

    var normal = 0
        , escaped = 1
        , csi = 2
        , osc = 3
        , charset = 4
        , dcs = 5
        , ignore = 6;

    /**
     * Terminal
     */

    function Terminal(options) {
        var self = this;

        if (!(this instanceof Terminal)) {
            return new Terminal(arguments[0], arguments[1], arguments[2]);
        }

        EventEmitter.call(this);

        if (typeof options === 'number') {
            options = {
                cols: arguments[0],
                rows: arguments[1],
                handler: arguments[2]
            };
        }

        options = options || {};

        each(keys(Terminal.defaults), function(key) {
            if (options[key] == null) {
                options[key] = Terminal.options[key];
                // Legacy:
                if (Terminal[key] !== Terminal.defaults[key]) {
                    options[key] = Terminal[key];
                }
            }
            self[key] = options[key];
        });

        if (options.colors.length === 8) {
            options.colors = options.colors.concat(Terminal._colors.slice(8));
        } else if (options.colors.length === 16) {
            options.colors = options.colors.concat(Terminal._colors.slice(16));
        } else if (options.colors.length === 10) {
            options.colors = options.colors.slice(0, -2).concat(
                Terminal._colors.slice(8, -2), options.colors.slice(-2));
        } else if (options.colors.length === 18) {
            options.colors = options.colors.slice(0, -2).concat(
                Terminal._colors.slice(16, -2), options.colors.slice(-2));
        }
        this.colors = options.colors;

        this.options = options;

        // this.context = options.context || window;
        // this.document = options.document || document;
        this.parent = options.body || options.parent
            || (document ? document.getElementsByTagName('body')[0] : null);

        this.cols = options.cols || options.geometry[0];
        this.rows = options.rows || options.geometry[1];

        if (options.handler) {
            this.on('data', options.handler);
        }

        this.ybase = 0;
        this.ydisp = 0;
        this.x = 0;
        this.y = 0;
        this.cursorState = 0;
        this.cursorHidden = false;
        this.convertEol;
        this.state = 0;
        this.queue = '';
        this.scrollTop = 0;
        this.scrollBottom = this.rows - 1;

        // modes
        this.applicationKeypad = false;
        this.applicationCursor = false;
        this.originMode = false;
        this.insertMode = false;
        this.wraparoundMode = false;
        this.normal = null;

        // select modes
        this.prefixMode = false;
        this.selectMode = false;
        this.visualMode = false;
        this.searchMode = false;
        this.searchDown;
        this.entry = '';
        this.entryPrefix = 'Search: ';
        this._real;
        this._selected;
        this._textarea;

        // charset
        this.charset = null;
        this.gcharset = null;
        this.glevel = 0;
        this.charsets = [null];

        // mouse properties
        this.decLocator;
        this.x10Mouse;
        this.vt200Mouse;
        this.vt300Mouse;
        this.normalMouse;
        this.mouseEvents;
        this.sendFocus;
        this.utfMouse;
        this.sgrMouse;
        this.urxvtMouse;

        // misc
        this.element;
        this.children;
        this.refreshStart;
        this.refreshEnd;
        this.savedX;
        this.savedY;
        this.savedCols;

        // stream
        this.readable = true;
        this.writable = true;

        this.defAttr = (0 << 18) | (257 << 9) | (256 << 0);
        this.curAttr = this.defAttr;

        this.params = [];
        this.currentParam = 0;
        this.prefix = '';
        this.postfix = '';

        this.lines = [];
        var i = this.rows;
        while (i--) {
            this.lines.push(this.blankLine());
        }

        this.tabs;
        this.setupStops();
    }

    inherits(Terminal, EventEmitter);

// back_color_erase feature for xterm.
    Terminal.prototype.eraseAttr = function() {
        // if (this.is('screen')) return this.defAttr;
        return (this.defAttr & ~0x1ff) | (this.curAttr & 0x1ff);
    };

    /**
     * Colors
     */

// Colors 0-15
    Terminal.tangoColors = [
        // dark:
        '#2e3436',
        '#cc0000',
        '#4e9a06',
        '#c4a000',
        '#3465a4',
        '#75507b',
        '#06989a',
        '#d3d7cf',
        // bright:
        '#555753',
        '#ef2929',
        '#8ae234',
        '#fce94f',
        '#729fcf',
        '#ad7fa8',
        '#34e2e2',
        '#eeeeec'
    ];

    Terminal.xtermColors = [
        // dark:
        '#000000', // black
        '#cd0000', // red3
        '#00cd00', // green3
        '#cdcd00', // yellow3
        '#0000ee', // blue2
        '#cd00cd', // magenta3
        '#00cdcd', // cyan3
        '#e5e5e5', // gray90
        // bright:
        '#7f7f7f', // gray50
        '#ff0000', // red
        '#00ff00', // green
        '#ffff00', // yellow
        '#5c5cff', // rgb:5c/5c/ff
        '#ff00ff', // magenta
        '#00ffff', // cyan
        '#ffffff'  // white
    ];

// Colors 0-15 + 16-255
// Much thanks to TooTallNate for writing this.
    Terminal.colors = (function() {
        var colors = Terminal.tangoColors.slice()
            , r = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff]
            , i;

        // 16-231
        i = 0;
        for (; i < 216; i++) {
            out(r[(i / 36) % 6 | 0], r[(i / 6) % 6 | 0], r[i % 6]);
        }

        // 232-255 (grey)
        i = 0;
        for (; i < 24; i++) {
            r = 8 + i * 10;
            out(r, r, r);
        }

        function out(r, g, b) {
            colors.push('#' + hex(r) + hex(g) + hex(b));
        }

        function hex(c) {
            c = c.toString(16);
            return c.length < 2 ? '0' + c : c;
        }

        return colors;
    })();

    // Default BG/FG
    Terminal.colors[256] = '#f0f0f0';
    Terminal.colors[257] = '#555753';
    //Terminal.colors[256] = '#000000';
    //Terminal.colors[257] = '#f0f0f0';

    Terminal._colors = Terminal.colors.slice();

    Terminal.vcolors = (function() {
        var out = []
            , colors = Terminal.colors
            , i = 0
            , color;

        for (; i < 256; i++) {
            color = parseInt(colors[i].substring(1), 16);
            out.push([
                    (color >> 16) & 0xff,
                    (color >> 8) & 0xff,
                    color & 0xff
            ]);
        }

        return out;
    })();

    /**
     * Options
     */

    Terminal.defaults = {
        colors: Terminal.tangoColors,
        convertEol: false,
        termName: 'xterm',
        geometry: [80, 24],
        cursorBlink: true,
        visualBell: false,
        popOnBell: false,
        scrollback: 1000,
        screenKeys: false,
        debug: false,
        useStyle: false
        // programFeatures: false,
        // focusKeys: false,
    };

    Terminal.options = {};

    each(keys(Terminal.defaults), function(key) {
        Terminal[key] = Terminal.defaults[key];
        Terminal.options[key] = Terminal.defaults[key];
    });

    /**
     * Focused Terminal
     */

    Terminal.focus = null;

    Terminal.prototype.focus = function() {
        if (Terminal.focus === this) return;

        if (Terminal.focus) {
            Terminal.focus.blur();
        }

        if (this.sendFocus) this.send('\x1b[I');
        this.showCursor();

        // try {
        //   this.element.focus();
        // } catch (e) {
        //   ;
        // }

        // this.emit('focus');

        Terminal.focus = this;
    };

    Terminal.prototype.blur = function() {
        if (Terminal.focus !== this) return;

        this.cursorState = 0;
        this.refresh(this.y, this.y);
        if (this.sendFocus) this.send('\x1b[O');

        // try {
        //   this.element.blur();
        // } catch (e) {
        //   ;
        // }

        // this.emit('blur');

        Terminal.focus = null;
    };

    /**
     * Initialize global behavior
     */

    Terminal.prototype.initGlobal = function() {

        Terminal._boundDocs = Terminal._boundDocs || [];
        if (~indexOf(Terminal._boundDocs, document)) {
            return;
        }
        Terminal._boundDocs.push(document);

        //Terminal.bindPaste(document);

        //Terminal.bindKeys(document);

        //Terminal.bindCopy(document);

        if (this.isMobile) {
            this.fixMobile(document);
        }

        if (this.useStyle) {
            Terminal.insertStyle(document, this.colors[256], this.colors[257]);
        }
    };

    /**
     * Bind to paste event
     */

    Terminal.bindPaste = function(document) {
        // This seems to work well for ctrl-V and middle-click,
        // even without the contentEditable workaround.
        var window = document.defaultView;
        on(window, 'paste', function(ev) {
            var term = Terminal.focus;
            if (!term) return;
            if (ev.clipboardData) {
                term.send(ev.clipboardData.getData('text/plain'));
            } else if (term.context.clipboardData) {
                term.send(term.context.clipboardData.getData('Text'));
            }
            // Not necessary. Do it anyway for good measure.
            term.element.contentEditable = 'inherit';
            return cancel(ev);
        });
    };

    /**
     * Global Events for key handling
     */

    Terminal.bindKeys = function(document) {
        // We should only need to check `target === body` below,
        // but we can check everything for good measure.
        on(document, 'keydown', function(ev) {
            if (!Terminal.focus) return;
            var target = ev.target || ev.srcElement;
            if (!target) return;
            if (target === Terminal.focus.element
                || target === Terminal.focus.context
                || target === Terminal.focus.document
                || target === Terminal.focus.body
                || target === Terminal._textarea
                || target === Terminal.focus.parent) {
                return Terminal.focus.keyDown(ev);
            }
        }, true);

        on(document, 'keypress', function(ev) {
            if (!Terminal.focus) return;
            var target = ev.target || ev.srcElement;
            if (!target) return;
            if (target === Terminal.focus.element
                || target === Terminal.focus.context
                || target === Terminal.focus.document
                || target === Terminal.focus.body
                || target === Terminal._textarea
                || target === Terminal.focus.parent) {
                return Terminal.focus.keyPress(ev);
            }
        }, true);

        // If we click somewhere other than a
        // terminal, unfocus the terminal.
        on(document, 'mousedown', function(ev) {
            if (!Terminal.focus) return;

            var el = ev.target || ev.srcElement;
            if (!el) return;

            do {
                if (el === Terminal.focus.element) return;
            } while (el = el.parentNode);

            Terminal.focus.blur();
        });
    };

    /**
     * Copy Selection w/ Ctrl-C (Select Mode)
     */

    Terminal.bindCopy = function(document) {
        var window = document.defaultView;

        // if (!('onbeforecopy' in document)) {
        //   // Copies to *only* the clipboard.
        //   on(window, 'copy', function fn(ev) {
        //     var term = Terminal.focus;
        //     if (!term) return;
        //     if (!term._selected) return;
        //     var text = term.grabText(
        //       term._selected.x1, term._selected.x2,
        //       term._selected.y1, term._selected.y2);
        //     term.emit('copy', text);
        //     ev.clipboardData.setData('text/plain', text);
        //   });
        //   return;
        // }

        // Copies to primary selection *and* clipboard.
        // NOTE: This may work better on capture phase,
        // or using the `beforecopy` event.
        on(window, 'copy', function(ev) {
            var term = Terminal.focus;
            if (!term) return;
            if (!term._selected) return;
            var textarea = term.getCopyTextarea();
            var text = term.grabText(
                term._selected.x1, term._selected.x2,
                term._selected.y1, term._selected.y2);
            term.emit('copy', text);
            textarea.focus();
            textarea.textContent = text;
            textarea.value = text;
            textarea.setSelectionRange(0, text.length);
            setTimeout(function() {
                term.element.focus();
                term.focus();
            }, 1);
        });
    };

    /**
     * Fix Mobile
     */

    Terminal.prototype.fixMobile = function(document) {
        var self = this;

        var textarea = document.createElement('textarea');
        textarea.style.position = 'absolute';
        textarea.style.left = '-32000px';
        textarea.style.top = '-32000px';
        textarea.style.width = '0px';
        textarea.style.height = '0px';
        textarea.style.opacity = '0';
        textarea.style.backgroundColor = 'transparent';
        textarea.style.borderStyle = 'none';
        textarea.style.outlineStyle = 'none';
        textarea.autocapitalize = 'none';
        textarea.autocorrect = 'off';

        document.getElementsByTagName('body')[0].appendChild(textarea);

        Terminal._textarea = textarea;

        setTimeout(function() {
            textarea.focus();
        }, 1000);

        if (this.isAndroid) {
            on(textarea, 'change', function() {
                var value = textarea.textContent || textarea.value;
                textarea.value = '';
                textarea.textContent = '';
                self.send(value + '\r');
            });
        }
    };

    /**
     * Insert a default style
     */

    Terminal.insertStyle = function(document, bg, fg) {
        var style = document.getElementById('term-style');
        if (style) return;

        var head = document.getElementsByTagName('head')[0];
        if (!head) return;

        var style = document.createElement('style');
        style.id = 'term-style';

        // textContent doesn't work well with IE for <style> elements.
        style.innerHTML = ''
            + '.terminal {\n'
            //+ '  float: left;\n'
            + '  border: ' + bg + ' solid 5px;\n'
            + '  font-family: "DejaVu Sans Mono", "Liberation Mono", monospace;\n'
            + '  font-size: 11px;\n'
            + '  color: ' + fg + ';\n'
            + '  background: ' + bg + ';\n'
            + '}\n'
            + '\n'
            + '.terminal-cursor {\n'
            + '  color: ' + bg + ';\n'
            + '  background: ' + fg + ';\n'
            + '}\n';

        // var out = '';
        // each(Terminal.colors, function(color, i) {
        //   if (i === 256) {
        //     out += '\n.term-bg-color-default { background-color: ' + color + '; }';
        //   }
        //   if (i === 257) {
        //     out += '\n.term-fg-color-default { color: ' + color + '; }';
        //   }
        //   out += '\n.term-bg-color-' + i + ' { background-color: ' + color + '; }';
        //   out += '\n.term-fg-color-' + i + ' { color: ' + color + '; }';
        // });
        // style.innerHTML += out + '\n';

        head.insertBefore(style, head.firstChild);
    };

    /**
     * Open Terminal
     */

    Terminal.prototype.open = function(parent) {
        var self = this
            , i = 0
            , div;

        this.parent = parent || this.parent;

        if (!this.parent) {
            throw new Error('Terminal requires a parent element.');
        }

        this.context=document.defaultView;
        this.body = $('body');


        // Create our main terminal element.
        this.element = document.createElement('div');
        this.element.className = 'terminal';
        this.element.style.outline = 'none';
        this.element.setAttribute('tabindex', 0);
        this.element.setAttribute('spellcheck', 'false');
        this.element.style.backgroundColor = this.colors[256];
        this.element.style.color = this.colors[257];

        // Create the lines for our terminal.
        this.children = [];
        for (; i < this.rows; i++) {
            div = document.createElement('div');
            this.element.appendChild(div);
            this.children.push(div);
        }
        this.parent.append(this.element);

        // Draw the screen.
        this.refresh(0, this.rows - 1);

        // Initialize global actions that
        // need to be taken on the document.
        this.initGlobal();

        // Ensure there is a Terminal.focus.
        //this.focus();

        // Start blinking the cursor.
        this.startBlink();

        // Bind to DOM events related
        // to focus and paste behavior.
        on(this.element, 'focus', function() {
            self.focus();
            if (self.isMobile) {
                Terminal._textarea.focus();
            }
        });

        // This causes slightly funky behavior.
        // on(this.element, 'blur', function() {
        //   self.blur();
        // });

        on(this.element, 'mousedown', function() {
            self.focus();
        });

        // Clickable paste workaround, using contentEditable.
        // This probably shouldn't work,
        // ... but it does. Firefox's paste
        // event seems to only work for textareas?
        on(this.element, 'mousedown', function(ev) {
            var button = ev.button != null
                ? +ev.button
                : ev.which != null
                ? ev.which - 1
                : null;

            // Does IE9 do this?
            if (self.isMSIE) {
                button = button === 1 ? 0 : button === 4 ? 1 : button;
            }

            if (button !== 2) return;

            self.element.contentEditable = 'true';
            setTimeout(function() {
                self.element.contentEditable = 'inherit'; // 'false';
            }, 1);
        }, true);

        // Listen for mouse events and translate
        // them into terminal mouse protocols.
        this.bindMouse();

        // Figure out whether boldness affects
        // the character width of monospace fonts.
        if (Terminal.brokenBold == null) {
            Terminal.brokenBold = isBoldBroken(document);
        }

        // this.emit('open');

        // This can be useful for pasting,
        // as well as the iPad fix.
        /*
        setTimeout(function() {
            self.element.focus();
        }, 100);*/
    };

// XTerm mouse events
// http://invisible-island.net/xterm/ctlseqs/ctlseqs.html#Mouse%20Tracking
// To better understand these
// the xterm code is very helpful:
// Relevant files:
//   button.c, charproc.c, misc.c
// Relevant functions in xterm/button.c:
//   BtnCode, EmitButtonCode, EditorButton, SendMousePosition
    Terminal.prototype.bindMouse = function() {
        var el = this.element
            , self = this
            , pressed = 32;

        var wheelEvent = 'onmousewheel' in this.context
            ? 'mousewheel'
            : 'DOMMouseScroll';

        // mouseup, mousedown, mousewheel
        // left click: ^[[M 3<^[[M#3<
        // mousewheel up: ^[[M`3>
        function sendButton(ev) {
            var button
                , pos;

            // get the xterm-style button
            button = getButton(ev);

            // get mouse coordinates
            pos = getCoords(ev);
            if (!pos) return;

            sendEvent(button, pos);

            switch (ev.type) {
                case 'mousedown':
                    pressed = button;
                    break;
                case 'mouseup':
                    // keep it at the left
                    // button, just in case.
                    pressed = 32;
                    break;
                case wheelEvent:
                    // nothing. don't
                    // interfere with
                    // `pressed`.
                    break;
            }
        }

        // motion example of a left click:
        // ^[[M 3<^[[M@4<^[[M@5<^[[M@6<^[[M@7<^[[M#7<
        function sendMove(ev) {
            var button = pressed
                , pos;

            pos = getCoords(ev);
            if (!pos) return;

            // buttons marked as motions
            // are incremented by 32
            button += 32;

            sendEvent(button, pos);
        }

        // encode button and
        // position to characters
        function encode(data, ch) {
            if (!self.utfMouse) {
                if (ch === 255) return data.push(0);
                if (ch > 127) ch = 127;
                data.push(ch);
            } else {
                if (ch === 2047) return data.push(0);
                if (ch < 127) {
                    data.push(ch);
                } else {
                    if (ch > 2047) ch = 2047;
                    data.push(0xC0 | (ch >> 6));
                    data.push(0x80 | (ch & 0x3F));
                }
            }
        }

        // send a mouse event:
        // regular/utf8: ^[[M Cb Cx Cy
        // urxvt: ^[[ Cb ; Cx ; Cy M
        // sgr: ^[[ Cb ; Cx ; Cy M/m
        // vt300: ^[[ 24(1/3/5)~ [ Cx , Cy ] \r
        // locator: CSI P e ; P b ; P r ; P c ; P p & w
        function sendEvent(button, pos) {
            // self.emit('mouse', {
            //   x: pos.x - 32,
            //   y: pos.x - 32,
            //   button: button
            // });

            if (self.vt300Mouse) {
                // NOTE: Unstable.
                // http://www.vt100.net/docs/vt3xx-gp/chapter15.html
                button &= 3;
                pos.x -= 32;
                pos.y -= 32;
                var data = '\x1b[24';
                if (button === 0) data += '1';
                else if (button === 1) data += '3';
                else if (button === 2) data += '5';
                else if (button === 3) return;
                else data += '0';
                data += '~[' + pos.x + ',' + pos.y + ']\r';
                self.send(data);
                return;
            }

            if (self.decLocator) {
                // NOTE: Unstable.
                button &= 3;
                pos.x -= 32;
                pos.y -= 32;
                if (button === 0) button = 2;
                else if (button === 1) button = 4;
                else if (button === 2) button = 6;
                else if (button === 3) button = 3;
                self.send('\x1b['
                    + button
                    + ';'
                    + (button === 3 ? 4 : 0)
                    + ';'
                    + pos.y
                    + ';'
                    + pos.x
                    + ';'
                    + (pos.page || 0)
                    + '&w');
                return;
            }

            if (self.urxvtMouse) {
                pos.x -= 32;
                pos.y -= 32;
                pos.x++;
                pos.y++;
                self.send('\x1b[' + button + ';' + pos.x + ';' + pos.y + 'M');
                return;
            }

            if (self.sgrMouse) {
                pos.x -= 32;
                pos.y -= 32;
                self.send('\x1b[<'
                    + ((button & 3) === 3 ? button & ~3 : button)
                    + ';'
                    + pos.x
                    + ';'
                    + pos.y
                    + ((button & 3) === 3 ? 'm' : 'M'));
                return;
            }

            var data = [];

            encode(data, button);
            encode(data, pos.x);
            encode(data, pos.y);

            self.send('\x1b[M' + String.fromCharCode.apply(String, data));
        }

        function getButton(ev) {
            var button
                , shift
                , meta
                , ctrl
                , mod;

            // two low bits:
            // 0 = left
            // 1 = middle
            // 2 = right
            // 3 = release
            // wheel up/down:
            // 1, and 2 - with 64 added
            switch (ev.type) {
                case 'mousedown':
                    button = ev.button != null
                        ? +ev.button
                        : ev.which != null
                        ? ev.which - 1
                        : null;

                    if (self.isMSIE) {
                        button = button === 1 ? 0 : button === 4 ? 1 : button;
                    }
                    break;
                case 'mouseup':
                    button = 3;
                    break;
                case 'DOMMouseScroll':
                    button = ev.detail < 0
                        ? 64
                        : 65;
                    break;
                case 'mousewheel':
                    button = ev.wheelDeltaY > 0
                        ? 64
                        : 65;
                    break;
            }

            // next three bits are the modifiers:
            // 4 = shift, 8 = meta, 16 = control
            shift = ev.shiftKey ? 4 : 0;
            meta = ev.metaKey ? 8 : 0;
            ctrl = ev.ctrlKey ? 16 : 0;
            mod = shift | meta | ctrl;

            // no mods
            if (self.vt200Mouse) {
                // ctrl only
                mod &= ctrl;
            } else if (!self.normalMouse) {
                mod = 0;
            }

            // increment to SP
            button = (32 + (mod << 2)) + button;

            return button;
        }

        // mouse coordinates measured in cols/rows
        function getCoords(ev) {
            var x, y, w, h, el;

            // ignore browsers without pageX for now
            if (ev.pageX == null) return;

            x = ev.pageX;
            y = ev.pageY;
            el = self.element;

            // should probably check offsetParent
            // but this is more portable
            while (el && el !== self.document.documentElement) {
                x -= el.offsetLeft;
                y -= el.offsetTop;
                el = 'offsetParent' in el
                    ? el.offsetParent
                    : el.parentNode;
            }

            // convert to cols/rows
            w = self.element.clientWidth;
            h = self.element.clientHeight;
            x = Math.round((x / w) * self.cols);
            y = Math.round((y / h) * self.rows);

            // be sure to avoid sending
            // bad positions to the program
            if (x < 0) x = 0;
            if (x > self.cols) x = self.cols;
            if (y < 0) y = 0;
            if (y > self.rows) y = self.rows;

            // xterm sends raw bytes and
            // starts at 32 (SP) for each.
            x += 32;
            y += 32;

            return {
                x: x,
                y: y,
                type: ev.type === wheelEvent
                    ? 'mousewheel'
                    : ev.type
            };
        }

        on(el, 'mousedown', function(ev) {
            if (!self.mouseEvents) return;

            // send the button
            sendButton(ev);

            // ensure focus
            self.focus();

            // fix for odd bug
            //if (self.vt200Mouse && !self.normalMouse) {
            if (self.vt200Mouse) {
                sendButton({ __proto__: ev, type: 'mouseup' });
                return cancel(ev);
            }

            // bind events
            if (self.normalMouse) on(self.document, 'mousemove', sendMove);

            // x10 compatibility mode can't send button releases
            if (!self.x10Mouse) {
                on(self.document, 'mouseup', function up(ev) {
                    sendButton(ev);
                    if (self.normalMouse) off(self.document, 'mousemove', sendMove);
                    off(self.document, 'mouseup', up);
                    return cancel(ev);
                });
            }

            return cancel(ev);
        });

        //if (self.normalMouse) {
        //  on(self.document, 'mousemove', sendMove);
        //}

        on(el, wheelEvent, function(ev) {
            if (!self.mouseEvents) return;
            if (self.x10Mouse
                || self.vt300Mouse
                || self.decLocator) return;
            sendButton(ev);
            return cancel(ev);
        });

        // allow mousewheel scrolling in
        // the shell for example
        on(el, wheelEvent, function(ev) {
            if (self.mouseEvents) return;
            if (self.applicationKeypad) return;
            if (ev.type === 'DOMMouseScroll') {
                self.scrollDisp(ev.detail < 0 ? -5 : 5);
            } else {
                self.scrollDisp(ev.wheelDeltaY > 0 ? -5 : 5);
            }
            return cancel(ev);
        });
    };

    /**
     * Destroy Terminal
     */

    Terminal.prototype.destroy = function() {
        this.readable = false;
        this.writable = false;
        this._events = {};
        this.handler = function() {};
        this.write = function() {};
        if (this.element.parentNode) {
            this.element.parentNode.removeChild(this.element);
        }
        //this.emit('close');
    };

    /**
     * Rendering Engine
     */

// In the screen buffer, each character
// is stored as a an array with a character
// and a 32-bit integer.
// First value: a utf-16 character.
// Second value:
// Next 9 bits: background color (0-511).
// Next 9 bits: foreground color (0-511).
// Next 14 bits: a mask for misc. flags:
//   1=bold, 2=underline, 4=blink, 8=inverse, 16=invisible

    Terminal.prototype.refresh = function(start, end) {
        var x
            , y
            , i
            , line
            , out
            , ch
            , width
            , data
            , attr
            , bg
            , fg
            , flags
            , row
            , parent;

        if (end - start >= this.rows / 2) {
            parent = this.element.parentNode;
            if (parent) parent.removeChild(this.element);
        }

        width = this.cols;
        y = start;

        if (end >= this.lines.length) {
            this.log('`end` is too large. Most likely a bad CSR.');
            end = this.lines.length - 1;
        }

        for (; y <= end; y++) {
            row = y + this.ydisp;

            line = this.lines[row];
            out = '';

            if (y === this.y
                && this.cursorState
                && (this.ydisp === this.ybase || this.selectMode)
                && !this.cursorHidden) {
                x = this.x;
            } else {
                x = -1;
            }

            attr = this.defAttr;
            i = 0;

            for (; i < width; i++) {
                data = line[i][0];
                ch = line[i][1];

                if (i === x) data = -1;

                if (data !== attr) {
                    if (attr !== this.defAttr) {
                        out += '</span>';
                    }
                    if (data !== this.defAttr) {
                        if (data === -1) {
                            out += '<span class="reverse-video terminal-cursor">';
                        } else {
                            out += '<span style="';

                            bg = data & 0x1ff;
                            fg = (data >> 9) & 0x1ff;
                            flags = data >> 18;

                            // bold
                            if (flags & 1) {
                                if (!Terminal.brokenBold) {
                                    out += 'font-weight:bold;';
                                }
                                // See: XTerm*boldColors
                                if (fg < 8) fg += 8;
                            }

                            // underline
                            if (flags & 2) {
                                out += 'text-decoration:underline;';
                            }

                            // blink
                            if (flags & 4) {
                                if (flags & 2) {
                                    out = out.slice(0, -1);
                                    out += ' blink;';
                                } else {
                                    out += 'text-decoration:blink;';
                                }
                            }

                            // inverse
                            if (flags & 8) {
                                bg = (data >> 9) & 0x1ff;
                                fg = data & 0x1ff;
                                // Should inverse just be before the
                                // above boldColors effect instead?
                                if ((flags & 1) && fg < 8) fg += 8;
                            }

                            // invisible
                            if (flags & 16) {
                                out += 'visibility:hidden;';
                            }

                            // out += '" class="'
                            //   + 'term-bg-color-' + bg
                            //   + ' '
                            //   + 'term-fg-color-' + fg
                            //   + '">';

                            if (bg !== 256) {
                                out += 'background-color:'
                                    + this.colors[bg]
                                    + ';';
                            }

                            if (fg !== 257) {
                                out += 'color:'
                                    + this.colors[fg]
                                    + ';';
                            }

                            out += '">';
                        }
                    }
                }

                switch (ch) {
                    case '&':
                        out += '&amp;';
                        break;
                    case '<':
                        out += '&lt;';
                        break;
                    case '>':
                        out += '&gt;';
                        break;
                    default:
                        if (ch <= ' ') {
                            out += '&nbsp;';
                        } else {
                            if (isWide(ch)) i++;
                            out += ch;
                        }
                        break;
                }

                attr = data;
            }

            if (attr !== this.defAttr) {
                out += '</span>';
            }

            this.children[y].innerHTML = out;
        }

        if (parent) parent.appendChild(this.element);
    };

    Terminal.prototype._cursorBlink = function() {
        //if (Terminal.focus !== this) return;
        this.cursorState ^= 1;
        this.refresh(this.y, this.y);
    };

    Terminal.prototype.showCursor = function() {
        if (!this.cursorState) {
            this.cursorState = 1;
            this.refresh(this.y, this.y);
        } else {
            // Temporarily disabled:
            // this.refreshBlink();
        }
    };

    Terminal.prototype.startBlink = function() {
        if (!this.cursorBlink) return;
        var self = this;
        this._blinker = function() {
            self._cursorBlink();
        };
        this._blink = setInterval(this._blinker, 500);
    };

    Terminal.prototype.refreshBlink = function() {
        if (!this.cursorBlink) return;
        clearInterval(this._blink);
        this._blink = setInterval(this._blinker, 500);
    };

    Terminal.prototype.scroll = function() {
        var row;

        if (++this.ybase === this.scrollback) {
            this.ybase = this.ybase / 2 | 0;
            this.lines = this.lines.slice(-(this.ybase + this.rows) + 1);
        }

        this.ydisp = this.ybase;

        // last line
        row = this.ybase + this.rows - 1;

        // subtract the bottom scroll region
        row -= this.rows - 1 - this.scrollBottom;

        if (row === this.lines.length) {
            // potential optimization:
            // pushing is faster than splicing
            // when they amount to the same
            // behavior.
            this.lines.push(this.blankLine());
        } else {
            // add our new line
            this.lines.splice(row, 0, this.blankLine());
        }

        if (this.scrollTop !== 0) {
            if (this.ybase !== 0) {
                this.ybase--;
                this.ydisp = this.ybase;
            }
            this.lines.splice(this.ybase + this.scrollTop, 1);
        }

        // this.maxRange();
        this.updateRange(this.scrollTop);
        this.updateRange(this.scrollBottom);
    };

    Terminal.prototype.scrollDisp = function(disp) {
        this.ydisp += disp;

        if (this.ydisp > this.ybase) {
            this.ydisp = this.ybase;
        } else if (this.ydisp < 0) {
            this.ydisp = 0;
        }

        this.refresh(0, this.rows - 1);
    };

    Terminal.prototype.write = function(data) {
        var l = data.length
            , i = 0
            , j
            , cs
            , ch;

        this.refreshStart = this.y;
        this.refreshEnd = this.y;

        if (this.ybase !== this.ydisp) {
            this.ydisp = this.ybase;
            this.maxRange();
        }

        // this.log(JSON.stringify(data.replace(/\x1b/g, '^[')));

        for (; i < l; i++) {
            ch = data[i];
            switch (this.state) {
                case normal:
                    switch (ch) {
                        // '\0'
                        // case '\0':
                        // case '\200':
                        //   break;

                        // '\a'
                        case '\x07':
                            this.bell();
                            break;

                        // '\n', '\v', '\f'
                        case '\n':
                        case '\x0b':
                        case '\x0c':
                            if (this.convertEol) {
                                this.x = 0;
                            }
                            // TODO: Implement eat_newline_glitch.
                            // if (this.realX >= this.cols) break;
                            // this.realX = 0;
                            this.y++;
                            if (this.y > this.scrollBottom) {
                                this.y--;
                                this.scroll();
                            }
                            break;

                        // '\r'
                        case '\r':
                            this.x = 0;
                            break;

                        // '\b'
                        case '\x08':
                            if (this.x > 0) {
                                this.x--;
                            }
                            break;

                        // '\t'
                        case '\t':
                            this.x = this.nextStop();
                            break;

                        // shift out
                        case '\x0e':
                            this.setgLevel(1);
                            break;

                        // shift in
                        case '\x0f':
                            this.setgLevel(0);
                            break;

                        // '\e'
                        case '\x1b':
                            this.state = escaped;
                            break;

                        default:
                            // ' '
                            if (ch >= ' ') {
                                if (this.charset && this.charset[ch]) {
                                    ch = this.charset[ch];
                                }

                                if (this.x >= this.cols) {
                                    this.x = 0;
                                    this.y++;
                                    if (this.y > this.scrollBottom) {
                                        this.y--;
                                        this.scroll();
                                    }
                                }

                                this.lines[this.y + this.ybase][this.x] = [this.curAttr, ch];
                                this.x++;
                                this.updateRange(this.y);

                                if (isWide(ch)) {
                                    j = this.y + this.ybase;
                                    if (this.cols < 2 || this.x >= this.cols) {
                                        this.lines[j][this.x - 1] = [this.curAttr, ' '];
                                        break;
                                    }
                                    this.lines[j][this.x] = [this.curAttr, ' '];
                                    this.x++;
                                }
                            }
                            break;
                    }
                    break;
                case escaped:
                    switch (ch) {
                        // ESC [ Control Sequence Introducer ( CSI is 0x9b).
                        case '[':
                            this.params = [];
                            this.currentParam = 0;
                            this.state = csi;
                            break;

                        // ESC ] Operating System Command ( OSC is 0x9d).
                        case ']':
                            this.params = [];
                            this.currentParam = 0;
                            this.state = osc;
                            break;

                        // ESC P Device Control String ( DCS is 0x90).
                        case 'P':
                            this.params = [];
                            this.currentParam = 0;
                            this.state = dcs;
                            break;

                        // ESC _ Application Program Command ( APC is 0x9f).
                        case '_':
                            this.state = ignore;
                            break;

                        // ESC ^ Privacy Message ( PM is 0x9e).
                        case '^':
                            this.state = ignore;
                            break;

                        // ESC c Full Reset (RIS).
                        case 'c':
                            this.reset();
                            break;

                        // ESC E Next Line ( NEL is 0x85).
                        // ESC D Index ( IND is 0x84).
                        case 'E':
                            this.x = 0;
                            ;
                        case 'D':
                            this.index();
                            break;

                        // ESC M Reverse Index ( RI is 0x8d).
                        case 'M':
                            this.reverseIndex();
                            break;

                        // ESC % Select default/utf-8 character set.
                        // @ = default, G = utf-8
                        case '%':
                            //this.charset = null;
                            this.setgLevel(0);
                            this.setgCharset(0, Terminal.charsets.US);
                            this.state = normal;
                            i++;
                            break;

                        // ESC (,),*,+,-,. Designate G0-G2 Character Set.
                        case '(': // <-- this seems to get all the attention
                        case ')':
                        case '*':
                        case '+':
                        case '-':
                        case '.':
                            switch (ch) {
                                case '(':
                                    this.gcharset = 0;
                                    break;
                                case ')':
                                    this.gcharset = 1;
                                    break;
                                case '*':
                                    this.gcharset = 2;
                                    break;
                                case '+':
                                    this.gcharset = 3;
                                    break;
                                case '-':
                                    this.gcharset = 1;
                                    break;
                                case '.':
                                    this.gcharset = 2;
                                    break;
                            }
                            this.state = charset;
                            break;

                        // Designate G3 Character Set (VT300).
                        // A = ISO Latin-1 Supplemental.
                        // Not implemented.
                        case '/':
                            this.gcharset = 3;
                            this.state = charset;
                            i--;
                            break;

                        // ESC N
                        // Single Shift Select of G2 Character Set
                        // ( SS2 is 0x8e). This affects next character only.
                        case 'N':
                            break;
                        // ESC O
                        // Single Shift Select of G3 Character Set
                        // ( SS3 is 0x8f). This affects next character only.
                        case 'O':
                            break;
                        // ESC n
                        // Invoke the G2 Character Set as GL (LS2).
                        case 'n':
                            this.setgLevel(2);
                            break;
                        // ESC o
                        // Invoke the G3 Character Set as GL (LS3).
                        case 'o':
                            this.setgLevel(3);
                            break;
                        // ESC |
                        // Invoke the G3 Character Set as GR (LS3R).
                        case '|':
                            this.setgLevel(3);
                            break;
                        // ESC }
                        // Invoke the G2 Character Set as GR (LS2R).
                        case '}':
                            this.setgLevel(2);
                            break;
                        // ESC ~
                        // Invoke the G1 Character Set as GR (LS1R).
                        case '~':
                            this.setgLevel(1);
                            break;

                        // ESC 7 Save Cursor (DECSC).
                        case '7':
                            this.saveCursor();
                            this.state = normal;
                            break;

                        // ESC 8 Restore Cursor (DECRC).
                        case '8':
                            this.restoreCursor();
                            this.state = normal;
                            break;

                        // ESC # 3 DEC line height/width
                        case '#':
                            this.state = normal;
                            i++;
                            break;

                        // ESC H Tab Set (HTS is 0x88).
                        case 'H':
                            this.tabSet();
                            break;

                        // ESC = Application Keypad (DECPAM).
                        case '=':
                            this.log('Serial port requested application keypad.');
                            this.applicationKeypad = true;
                            this.state = normal;
                            break;

                        // ESC > Normal Keypad (DECPNM).
                        case '>':
                            this.log('Switching back to normal keypad.');
                            this.applicationKeypad = false;
                            this.state = normal;
                            break;

                        default:
                            this.state = normal;
                            this.error('Unknown ESC control: %s.', ch);
                            break;
                    }
                    break;

                case charset:
                    switch (ch) {
                        case '0': // DEC Special Character and Line Drawing Set.
                            cs = Terminal.charsets.SCLD;
                            break;
                        case 'A': // UK
                            cs = Terminal.charsets.UK;
                            break;
                        case 'B': // United States (USASCII).
                            cs = Terminal.charsets.US;
                            break;
                        case '4': // Dutch
                            cs = Terminal.charsets.Dutch;
                            break;
                        case 'C': // Finnish
                        case '5':
                            cs = Terminal.charsets.Finnish;
                            break;
                        case 'R': // French
                            cs = Terminal.charsets.French;
                            break;
                        case 'Q': // FrenchCanadian
                            cs = Terminal.charsets.FrenchCanadian;
                            break;
                        case 'K': // German
                            cs = Terminal.charsets.German;
                            break;
                        case 'Y': // Italian
                            cs = Terminal.charsets.Italian;
                            break;
                        case 'E': // NorwegianDanish
                        case '6':
                            cs = Terminal.charsets.NorwegianDanish;
                            break;
                        case 'Z': // Spanish
                            cs = Terminal.charsets.Spanish;
                            break;
                        case 'H': // Swedish
                        case '7':
                            cs = Terminal.charsets.Swedish;
                            break;
                        case '=': // Swiss
                            cs = Terminal.charsets.Swiss;
                            break;
                        case '/': // ISOLatin (actually /A)
                            cs = Terminal.charsets.ISOLatin;
                            i++;
                            break;
                        default: // Default
                            cs = Terminal.charsets.US;
                            break;
                    }
                    this.setgCharset(this.gcharset, cs);
                    this.gcharset = null;
                    this.state = normal;
                    break;

                case osc:
                    // OSC Ps ; Pt ST
                    // OSC Ps ; Pt BEL
                    //   Set Text Parameters.
                    if (ch === '\x1b' || ch === '\x07') {
                        if (ch === '\x1b') i++;

                        this.params.push(this.currentParam);

                        switch (this.params[0]) {
                            case 0:
                            case 1:
                            case 2:
                                if (this.params[1]) {
                                    this.title = this.params[1];
                                    this.handleTitle(this.title);
                                }
                                break;
                            case 3:
                                // set X property
                                break;
                            case 4:
                            case 5:
                                // change dynamic colors
                                break;
                            case 10:
                            case 11:
                            case 12:
                            case 13:
                            case 14:
                            case 15:
                            case 16:
                            case 17:
                            case 18:
                            case 19:
                                // change dynamic ui colors
                                break;
                            case 46:
                                // change log file
                                break;
                            case 50:
                                // dynamic font
                                break;
                            case 51:
                                // emacs shell
                                break;
                            case 52:
                                // manipulate selection data
                                break;
                            case 104:
                            case 105:
                            case 110:
                            case 111:
                            case 112:
                            case 113:
                            case 114:
                            case 115:
                            case 116:
                            case 117:
                            case 118:
                                // reset colors
                                break;
                        }

                        this.params = [];
                        this.currentParam = 0;
                        this.state = normal;
                    } else {
                        if (!this.params.length) {
                            if (ch >= '0' && ch <= '9') {
                                this.currentParam =
                                    this.currentParam * 10 + ch.charCodeAt(0) - 48;
                            } else if (ch === ';') {
                                this.params.push(this.currentParam);
                                this.currentParam = '';
                            }
                        } else {
                            this.currentParam += ch;
                        }
                    }
                    break;

                case csi:
                    // '?', '>', '!'
                    if (ch === '?' || ch === '>' || ch === '!') {
                        this.prefix = ch;
                        break;
                    }

                    // 0 - 9
                    if (ch >= '0' && ch <= '9') {
                        this.currentParam = this.currentParam * 10 + ch.charCodeAt(0) - 48;
                        break;
                    }

                    // '$', '"', ' ', '\''
                    if (ch === '$' || ch === '"' || ch === ' ' || ch === '\'') {
                        this.postfix = ch;
                        break;
                    }

                    this.params.push(this.currentParam);
                    this.currentParam = 0;

                    // ';'
                    if (ch === ';') break;

                    this.state = normal;

                    switch (ch) {
                        // CSI Ps A
                        // Cursor Up Ps Times (default = 1) (CUU).
                        case 'A':
                            this.cursorUp(this.params);
                            break;

                        // CSI Ps B
                        // Cursor Down Ps Times (default = 1) (CUD).
                        case 'B':
                            this.cursorDown(this.params);
                            break;

                        // CSI Ps C
                        // Cursor Forward Ps Times (default = 1) (CUF).
                        case 'C':
                            this.cursorForward(this.params);
                            break;

                        // CSI Ps D
                        // Cursor Backward Ps Times (default = 1) (CUB).
                        case 'D':
                            this.cursorBackward(this.params);
                            break;

                        // CSI Ps ; Ps H
                        // Cursor Position [row;column] (default = [1,1]) (CUP).
                        case 'H':
                            this.cursorPos(this.params);
                            break;

                        // CSI Ps J  Erase in Display (ED).
                        case 'J':
                            this.eraseInDisplay(this.params);
                            break;

                        // CSI Ps K  Erase in Line (EL).
                        case 'K':
                            this.eraseInLine(this.params);
                            break;

                        // CSI Pm m  Character Attributes (SGR).
                        case 'm':
                            if (!this.prefix) {
                                this.charAttributes(this.params);
                            }
                            break;

                        // CSI Ps n  Device Status Report (DSR).
                        case 'n':
                            if (!this.prefix) {
                                this.deviceStatus(this.params);
                            }
                            break;

                    /**
                     * Additions
                     */

                        // CSI Ps @
                        // Insert Ps (Blank) Character(s) (default = 1) (ICH).
                        case '@':
                            this.insertChars(this.params);
                            break;

                        // CSI Ps E
                        // Cursor Next Line Ps Times (default = 1) (CNL).
                        case 'E':
                            this.cursorNextLine(this.params);
                            break;

                        // CSI Ps F
                        // Cursor Preceding Line Ps Times (default = 1) (CNL).
                        case 'F':
                            this.cursorPrecedingLine(this.params);
                            break;

                        // CSI Ps G
                        // Cursor Character Absolute  [column] (default = [row,1]) (CHA).
                        case 'G':
                            this.cursorCharAbsolute(this.params);
                            break;

                        // CSI Ps L
                        // Insert Ps Line(s) (default = 1) (IL).
                        case 'L':
                            this.insertLines(this.params);
                            break;

                        // CSI Ps M
                        // Delete Ps Line(s) (default = 1) (DL).
                        case 'M':
                            this.deleteLines(this.params);
                            break;

                        // CSI Ps P
                        // Delete Ps Character(s) (default = 1) (DCH).
                        case 'P':
                            this.deleteChars(this.params);
                            break;

                        // CSI Ps X
                        // Erase Ps Character(s) (default = 1) (ECH).
                        case 'X':
                            this.eraseChars(this.params);
                            break;

                        // CSI Pm `  Character Position Absolute
                        //   [column] (default = [row,1]) (HPA).
                        case '`':
                            this.charPosAbsolute(this.params);
                            break;

                        // 141 61 a * HPR -
                        // Horizontal Position Relative
                        case 'a':
                            this.HPositionRelative(this.params);
                            break;

                        // CSI P s c
                        // Send Device Attributes (Primary DA).
                        // CSI > P s c
                        // Send Device Attributes (Secondary DA)
                        case 'c':
                            this.sendDeviceAttributes(this.params);
                            break;

                        // CSI Pm d
                        // Line Position Absolute  [row] (default = [1,column]) (VPA).
                        case 'd':
                            this.linePosAbsolute(this.params);
                            break;

                        // 145 65 e * VPR - Vertical Position Relative
                        case 'e':
                            this.VPositionRelative(this.params);
                            break;

                        // CSI Ps ; Ps f
                        //   Horizontal and Vertical Position [row;column] (default =
                        //   [1,1]) (HVP).
                        case 'f':
                            this.HVPosition(this.params);
                            break;

                        // CSI Pm h  Set Mode (SM).
                        // CSI ? Pm h - mouse escape codes, cursor escape codes
                        case 'h':
                            this.setMode(this.params);
                            break;

                        // CSI Pm l  Reset Mode (RM).
                        // CSI ? Pm l
                        case 'l':
                            this.resetMode(this.params);
                            break;

                        // CSI Ps ; Ps r
                        //   Set Scrolling Region [top;bottom] (default = full size of win-
                        //   dow) (DECSTBM).
                        // CSI ? Pm r
                        case 'r':
                            this.setScrollRegion(this.params);
                            break;

                        // CSI s
                        //   Save cursor (ANSI.SYS).
                        case 's':
                            this.saveCursor(this.params);
                            break;

                        // CSI u
                        //   Restore cursor (ANSI.SYS).
                        case 'u':
                            this.restoreCursor(this.params);
                            break;

                    /**
                     * Lesser Used
                     */

                        // CSI Ps I
                        // Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
                        case 'I':
                            this.cursorForwardTab(this.params);
                            break;

                        // CSI Ps S  Scroll up Ps lines (default = 1) (SU).
                        case 'S':
                            this.scrollUp(this.params);
                            break;

                        // CSI Ps T  Scroll down Ps lines (default = 1) (SD).
                        // CSI Ps ; Ps ; Ps ; Ps ; Ps T
                        // CSI > Ps; Ps T
                        case 'T':
                            // if (this.prefix === '>') {
                            //   this.resetTitleModes(this.params);
                            //   break;
                            // }
                            // if (this.params.length > 2) {
                            //   this.initMouseTracking(this.params);
                            //   break;
                            // }
                            if (this.params.length < 2 && !this.prefix) {
                                this.scrollDown(this.params);
                            }
                            break;

                        // CSI Ps Z
                        // Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
                        case 'Z':
                            this.cursorBackwardTab(this.params);
                            break;

                        // CSI Ps b  Repeat the preceding graphic character Ps times (REP).
                        case 'b':
                            this.repeatPrecedingCharacter(this.params);
                            break;

                        // CSI Ps g  Tab Clear (TBC).
                        case 'g':
                            this.tabClear(this.params);
                            break;

                        // CSI Pm i  Media Copy (MC).
                        // CSI ? Pm i
                        // case 'i':
                        //   this.mediaCopy(this.params);
                        //   break;

                        // CSI Pm m  Character Attributes (SGR).
                        // CSI > Ps; Ps m
                        // case 'm': // duplicate
                        //   if (this.prefix === '>') {
                        //     this.setResources(this.params);
                        //   } else {
                        //     this.charAttributes(this.params);
                        //   }
                        //   break;

                        // CSI Ps n  Device Status Report (DSR).
                        // CSI > Ps n
                        // case 'n': // duplicate
                        //   if (this.prefix === '>') {
                        //     this.disableModifiers(this.params);
                        //   } else {
                        //     this.deviceStatus(this.params);
                        //   }
                        //   break;

                        // CSI > Ps p  Set pointer mode.
                        // CSI ! p   Soft terminal reset (DECSTR).
                        // CSI Ps$ p
                        //   Request ANSI mode (DECRQM).
                        // CSI ? Ps$ p
                        //   Request DEC private mode (DECRQM).
                        // CSI Ps ; Ps " p
                        case 'p':
                            switch (this.prefix) {
                                // case '>':
                                //   this.setPointerMode(this.params);
                                //   break;
                                case '!':
                                    this.softReset(this.params);
                                    break;
                                // case '?':
                                //   if (this.postfix === '$') {
                                //     this.requestPrivateMode(this.params);
                                //   }
                                //   break;
                                // default:
                                //   if (this.postfix === '"') {
                                //     this.setConformanceLevel(this.params);
                                //   } else if (this.postfix === '$') {
                                //     this.requestAnsiMode(this.params);
                                //   }
                                //   break;
                            }
                            break;

                        // CSI Ps q  Load LEDs (DECLL).
                        // CSI Ps SP q
                        // CSI Ps " q
                        // case 'q':
                        //   if (this.postfix === ' ') {
                        //     this.setCursorStyle(this.params);
                        //     break;
                        //   }
                        //   if (this.postfix === '"') {
                        //     this.setCharProtectionAttr(this.params);
                        //     break;
                        //   }
                        //   this.loadLEDs(this.params);
                        //   break;

                        // CSI Ps ; Ps r
                        //   Set Scrolling Region [top;bottom] (default = full size of win-
                        //   dow) (DECSTBM).
                        // CSI ? Pm r
                        // CSI Pt; Pl; Pb; Pr; Ps$ r
                        // case 'r': // duplicate
                        //   if (this.prefix === '?') {
                        //     this.restorePrivateValues(this.params);
                        //   } else if (this.postfix === '$') {
                        //     this.setAttrInRectangle(this.params);
                        //   } else {
                        //     this.setScrollRegion(this.params);
                        //   }
                        //   break;

                        // CSI s     Save cursor (ANSI.SYS).
                        // CSI ? Pm s
                        // case 's': // duplicate
                        //   if (this.prefix === '?') {
                        //     this.savePrivateValues(this.params);
                        //   } else {
                        //     this.saveCursor(this.params);
                        //   }
                        //   break;

                        // CSI Ps ; Ps ; Ps t
                        // CSI Pt; Pl; Pb; Pr; Ps$ t
                        // CSI > Ps; Ps t
                        // CSI Ps SP t
                        // case 't':
                        //   if (this.postfix === '$') {
                        //     this.reverseAttrInRectangle(this.params);
                        //   } else if (this.postfix === ' ') {
                        //     this.setWarningBellVolume(this.params);
                        //   } else {
                        //     if (this.prefix === '>') {
                        //       this.setTitleModeFeature(this.params);
                        //     } else {
                        //       this.manipulateWindow(this.params);
                        //     }
                        //   }
                        //   break;

                        // CSI u     Restore cursor (ANSI.SYS).
                        // CSI Ps SP u
                        // case 'u': // duplicate
                        //   if (this.postfix === ' ') {
                        //     this.setMarginBellVolume(this.params);
                        //   } else {
                        //     this.restoreCursor(this.params);
                        //   }
                        //   break;

                        // CSI Pt; Pl; Pb; Pr; Pp; Pt; Pl; Pp$ v
                        // case 'v':
                        //   if (this.postfix === '$') {
                        //     this.copyRectagle(this.params);
                        //   }
                        //   break;

                        // CSI Pt ; Pl ; Pb ; Pr ' w
                        // case 'w':
                        //   if (this.postfix === '\'') {
                        //     this.enableFilterRectangle(this.params);
                        //   }
                        //   break;

                        // CSI Ps x  Request Terminal Parameters (DECREQTPARM).
                        // CSI Ps x  Select Attribute Change Extent (DECSACE).
                        // CSI Pc; Pt; Pl; Pb; Pr$ x
                        // case 'x':
                        //   if (this.postfix === '$') {
                        //     this.fillRectangle(this.params);
                        //   } else {
                        //     this.requestParameters(this.params);
                        //     //this.__(this.params);
                        //   }
                        //   break;

                        // CSI Ps ; Pu ' z
                        // CSI Pt; Pl; Pb; Pr$ z
                        // case 'z':
                        //   if (this.postfix === '\'') {
                        //     this.enableLocatorReporting(this.params);
                        //   } else if (this.postfix === '$') {
                        //     this.eraseRectangle(this.params);
                        //   }
                        //   break;

                        // CSI Pm ' {
                        // CSI Pt; Pl; Pb; Pr$ {
                        // case '{':
                        //   if (this.postfix === '\'') {
                        //     this.setLocatorEvents(this.params);
                        //   } else if (this.postfix === '$') {
                        //     this.selectiveEraseRectangle(this.params);
                        //   }
                        //   break;

                        // CSI Ps ' |
                        // case '|':
                        //   if (this.postfix === '\'') {
                        //     this.requestLocatorPosition(this.params);
                        //   }
                        //   break;

                        // CSI P m SP }
                        // Insert P s Column(s) (default = 1) (DECIC), VT420 and up.
                        // case '}':
                        //   if (this.postfix === ' ') {
                        //     this.insertColumns(this.params);
                        //   }
                        //   break;

                        // CSI P m SP ~
                        // Delete P s Column(s) (default = 1) (DECDC), VT420 and up
                        // case '~':
                        //   if (this.postfix === ' ') {
                        //     this.deleteColumns(this.params);
                        //   }
                        //   break;

                        default:
                            this.error('Unknown CSI code: %s.', ch);
                            break;
                    }

                    this.prefix = '';
                    this.postfix = '';
                    break;

                case dcs:
                    if (ch === '\x1b' || ch === '\x07') {
                        if (ch === '\x1b') i++;

                        switch (this.prefix) {
                            // User-Defined Keys (DECUDK).
                            case '':
                                break;

                            // Request Status String (DECRQSS).
                            // test: echo -e '\eP$q"p\e\\'
                            case '$q':
                                var pt = this.currentParam
                                    , valid = false;

                                switch (pt) {
                                    // DECSCA
                                    case '"q':
                                        pt = '0"q';
                                        break;

                                    // DECSCL
                                    case '"p':
                                        pt = '61"p';
                                        break;

                                    // DECSTBM
                                    case 'r':
                                        pt = ''
                                            + (this.scrollTop + 1)
                                            + ';'
                                            + (this.scrollBottom + 1)
                                            + 'r';
                                        break;

                                    // SGR
                                    case 'm':
                                        pt = '0m';
                                        break;

                                    default:
                                        this.error('Unknown DCS Pt: %s.', pt);
                                        pt = '';
                                        break;
                                }

                                this.send('\x1bP' + +valid + '$r' + pt + '\x1b\\');
                                break;

                            // Set Termcap/Terminfo Data (xterm, experimental).
                            case '+p':
                                break;

                            // Request Termcap/Terminfo String (xterm, experimental)
                            // Regular xterm does not even respond to this sequence.
                            // This can cause a small glitch in vim.
                            // test: echo -ne '\eP+q6b64\e\\'
                            case '+q':
                                var pt = this.currentParam
                                    , valid = false;

                                this.send('\x1bP' + +valid + '+r' + pt + '\x1b\\');
                                break;

                            default:
                                this.error('Unknown DCS prefix: %s.', this.prefix);
                                break;
                        }

                        this.currentParam = 0;
                        this.prefix = '';
                        this.state = normal;
                    } else if (!this.currentParam) {
                        if (!this.prefix && ch !== '$' && ch !== '+') {
                            this.currentParam = ch;
                        } else if (this.prefix.length === 2) {
                            this.currentParam = ch;
                        } else {
                            this.prefix += ch;
                        }
                    } else {
                        this.currentParam += ch;
                    }
                    break;

                case ignore:
                    // For PM and APC.
                    if (ch === '\x1b' || ch === '\x07') {
                        if (ch === '\x1b') i++;
                        this.state = normal;
                    }
                    break;
            }
        }

        this.updateRange(this.y);
        this.refresh(this.refreshStart, this.refreshEnd);
    };

    Terminal.prototype.writeln = function(data) {
        this.write(data + '\r\n');
    };

// Key Resources:
// https://developer.mozilla.org/en-US/docs/DOM/KeyboardEvent
    Terminal.prototype.keyDown = function(ev) {
        var self = this
            , key;

        switch (ev.keyCode) {
            // backspace
            case 8:
                if (ev.shiftKey) {
                    key = '\x08'; // ^H
                    break;
                }
                key = '\x7f'; // ^?
                break;
            // tab
            case 9:
                if (ev.shiftKey) {
                    key = '\x1b[Z';
                    break;
                }
                key = '\t';
                break;
            // return/enter
            case 13:
                key = '\r';
                break;
            // escape
            case 27:
                key = '\x1b';
                break;
            // left-arrow
            case 37:
                if (this.applicationCursor) {
                    key = '\x1bOD'; // SS3 as ^[O for 7-bit
                    //key = '\x8fD'; // SS3 as 0x8f for 8-bit
                    break;
                }
                key = '\x1b[D';
                break;
            // right-arrow
            case 39:
                if (this.applicationCursor) {
                    key = '\x1bOC';
                    break;
                }
                key = '\x1b[C';
                break;
            // up-arrow
            case 38:
                if (this.applicationCursor) {
                    key = '\x1bOA';
                    break;
                }
                if (ev.ctrlKey) {
                    this.scrollDisp(-1);
                    return cancel(ev);
                } else {
                    key = '\x1b[A';
                }
                break;
            // down-arrow
            case 40:
                if (this.applicationCursor) {
                    key = '\x1bOB';
                    break;
                }
                if (ev.ctrlKey) {
                    this.scrollDisp(1);
                    return cancel(ev);
                } else {
                    key = '\x1b[B';
                }
                break;
            // delete
            case 46:
                key = '\x1b[3~';
                break;
            // insert
            case 45:
                key = '\x1b[2~';
                break;
            // home
            case 36:
                if (this.applicationKeypad) {
                    key = '\x1bOH';
                    break;
                }
                key = '\x1bOH';
                break;
            // end
            case 35:
                if (this.applicationKeypad) {
                    key = '\x1bOF';
                    break;
                }
                key = '\x1bOF';
                break;
            // page up
            case 33:
                if (ev.shiftKey) {
                    this.scrollDisp(-(this.rows - 1));
                    return cancel(ev);
                } else {
                    key = '\x1b[5~';
                }
                break;
            // page down
            case 34:
                if (ev.shiftKey) {
                    this.scrollDisp(this.rows - 1);
                    return cancel(ev);
                } else {
                    key = '\x1b[6~';
                }
                break;
            // F1
            case 112:
                key = '\x1bOP';
                break;
            // F2
            case 113:
                key = '\x1bOQ';
                break;
            // F3
            case 114:
                key = '\x1bOR';
                break;
            // F4
            case 115:
                key = '\x1bOS';
                break;
            // F5
            case 116:
                key = '\x1b[15~';
                break;
            // F6
            case 117:
                key = '\x1b[17~';
                break;
            // F7
            case 118:
                key = '\x1b[18~';
                break;
            // F8
            case 119:
                key = '\x1b[19~';
                break;
            // F9
            case 120:
                key = '\x1b[20~';
                break;
            // F10
            case 121:
                key = '\x1b[21~';
                break;
            // F11
            case 122:
                key = '\x1b[23~';
                break;
            // F12
            case 123:
                key = '\x1b[24~';
                break;
            default:
                // a-z and space
                if (ev.ctrlKey) {
                    if (ev.keyCode >= 65 && ev.keyCode <= 90) {
                        // Ctrl-A
                        if (this.screenKeys) {
                            if (!this.prefixMode && !this.selectMode && ev.keyCode === 65) {
                                this.enterPrefix();
                                return cancel(ev);
                            }
                        }
                        // Ctrl-V
                        if (this.prefixMode && ev.keyCode === 86) {
                            this.leavePrefix();
                            return;
                        }
                        // Ctrl-C
                        if ((this.prefixMode || this.selectMode) && ev.keyCode === 67) {
                            if (this.visualMode) {
                                setTimeout(function() {
                                    self.leaveVisual();
                                }, 1);
                            }
                            return;
                        }
                        key = String.fromCharCode(ev.keyCode - 64);
                    } else if (ev.keyCode === 32) {
                        // NUL
                        key = String.fromCharCode(0);
                    } else if (ev.keyCode >= 51 && ev.keyCode <= 55) {
                        // escape, file sep, group sep, record sep, unit sep
                        key = String.fromCharCode(ev.keyCode - 51 + 27);
                    } else if (ev.keyCode === 56) {
                        // delete
                        key = String.fromCharCode(127);
                    } else if (ev.keyCode === 219) {
                        // ^[ - escape
                        key = String.fromCharCode(27);
                    } else if (ev.keyCode === 221) {
                        // ^] - group sep
                        key = String.fromCharCode(29);
                    }
                } else if ((!this.isMac && ev.altKey) || (this.isMac && ev.metaKey)) {
                    if (ev.keyCode >= 65 && ev.keyCode <= 90) {
                        key = '\x1b' + String.fromCharCode(ev.keyCode + 32);
                    } else if (ev.keyCode === 192) {
                        key = '\x1b`';
                    } else if (ev.keyCode >= 48 && ev.keyCode <= 57) {
                        key = '\x1b' + (ev.keyCode - 48);
                    }
                }
                break;
        }

        if (!key) return true;

        if (this.prefixMode) {
            this.leavePrefix();
            return cancel(ev);
        }

        if (this.selectMode) {
            this.keySelect(ev, key);
            return cancel(ev);
        }

        this.emit('keydown', ev);
        this.emit('key', key, ev);

        this.showCursor();
        this.handler(key);

        return cancel(ev);
    };

    Terminal.prototype.setgLevel = function(g) {
        this.glevel = g;
        this.charset = this.charsets[g];
    };

    Terminal.prototype.setgCharset = function(g, charset) {
        this.charsets[g] = charset;
        if (this.glevel === g) {
            this.charset = charset;
        }
    };

    Terminal.prototype.keyPress = function(ev) {
        var key;

        cancel(ev);

        if (ev.charCode) {
            key = ev.charCode;
        } else if (ev.which == null) {
            key = ev.keyCode;
        } else if (ev.which !== 0 && ev.charCode !== 0) {
            key = ev.which;
        } else {
            return false;
        }

        if (!key || ev.ctrlKey || ev.altKey || ev.metaKey) return false;

        key = String.fromCharCode(key);

        if (this.prefixMode) {
            this.leavePrefix();
            this.keyPrefix(ev, key);
            return false;
        }

        if (this.selectMode) {
            this.keySelect(ev, key);
            return false;
        }

        this.emit('keypress', key, ev);
        this.emit('key', key, ev);

        this.showCursor();
        this.handler(key);

        return false;
    };

    Terminal.prototype.send = function(data) {
        var self = this;

        if (!this.queue) {
            setTimeout(function() {
                self.handler(self.queue);
                self.queue = '';
            }, 1);
        }

        this.queue += data;
    };

    Terminal.prototype.bell = function() {
        this.emit('bell');
        if (!this.visualBell) return;
        var self = this;
        this.element.style.borderColor = 'white';
        setTimeout(function() {
            self.element.style.borderColor = '';
        }, 10);
        if (this.popOnBell) this.focus();
    };

    Terminal.prototype.log = function() {
        if (!this.debug) return;
        if (!this.context.console || !this.context.console.log) return;
        var args = Array.prototype.slice.call(arguments);
        this.context.console.log.apply(this.context.console, args);
    };

    Terminal.prototype.error = function() {
        if (!this.debug) return;
        if (!this.context.console || !this.context.console.error) return;
        var args = Array.prototype.slice.call(arguments);
        this.context.console.error.apply(this.context.console, args);
    };

    Terminal.prototype.resize = function(x, y) {
        var line
            , el
            , i
            , j
            , ch;

        if (x < 1) x = 1;
        if (y < 1) y = 1;

        // resize cols
        j = this.cols;
        if (j < x) {
            ch = [this.defAttr, ' ']; // does xterm use the default attr?
            i = this.lines.length;
            while (i--) {
                while (this.lines[i].length < x) {
                    this.lines[i].push(ch);
                }
            }
        } else if (j > x) {
            i = this.lines.length;
            while (i--) {
                while (this.lines[i].length > x) {
                    this.lines[i].pop();
                }
            }
        }
        this.setupStops(j);
        this.cols = x;

        // resize rows
        j = this.rows;
        if (j < y) {
            el = this.element;
            while (j++ < y) {
                if (this.lines.length < y + this.ybase) {
                    this.lines.push(this.blankLine());
                }
                if (this.children.length < y) {
                    line = document.createElement('div');
                    el.appendChild(line);
                    this.children.push(line);
                }
            }
        } else if (j > y) {
            while (j-- > y) {
                if (this.lines.length > y + this.ybase) {
                    this.lines.pop();
                }
                if (this.children.length > y) {
                    el = this.children.pop();
                    if (!el) continue;
                    el.parentNode.removeChild(el);
                }
            }
        }
        this.rows = y;

        // make sure the cursor stays on screen
        if (this.y >= y) this.y = y - 1;
        if (this.x >= x) this.x = x - 1;

        this.scrollTop = 0;
        this.scrollBottom = y - 1;

        this.refresh(0, this.rows - 1);

        // it's a real nightmare trying
        // to resize the original
        // screen buffer. just set it
        // to null for now.
        this.normal = null;
    };

    Terminal.prototype.updateRange = function(y) {
        if (y < this.refreshStart) this.refreshStart = y;
        if (y > this.refreshEnd) this.refreshEnd = y;
        // if (y > this.refreshEnd) {
        //   this.refreshEnd = y;
        //   if (y > this.rows - 1) {
        //     this.refreshEnd = this.rows - 1;
        //   }
        // }
    };

    Terminal.prototype.maxRange = function() {
        this.refreshStart = 0;
        this.refreshEnd = this.rows - 1;
    };

    Terminal.prototype.setupStops = function(i) {
        if (i != null) {
            if (!this.tabs[i]) {
                i = this.prevStop(i);
            }
        } else {
            this.tabs = {};
            i = 0;
        }

        for (; i < this.cols; i += 8) {
            this.tabs[i] = true;
        }
    };

    Terminal.prototype.prevStop = function(x) {
        if (x == null) x = this.x;
        while (!this.tabs[--x] && x > 0);
        return x >= this.cols
            ? this.cols - 1
            : x < 0 ? 0 : x;
    };

    Terminal.prototype.nextStop = function(x) {
        if (x == null) x = this.x;
        while (!this.tabs[++x] && x < this.cols);
        return x >= this.cols
            ? this.cols - 1
            : x < 0 ? 0 : x;
    };

    Terminal.prototype.eraseRight = function(x, y) {
        var line = this.lines[this.ybase + y]
            , ch = [this.eraseAttr(), ' ']; // xterm


        for (; x < this.cols; x++) {
            line[x] = ch;
        }

        this.updateRange(y);
    };

    Terminal.prototype.eraseLeft = function(x, y) {
        var line = this.lines[this.ybase + y]
            , ch = [this.eraseAttr(), ' ']; // xterm

        x++;
        while (x--) line[x] = ch;

        this.updateRange(y);
    };

    Terminal.prototype.eraseLine = function(y) {
        this.eraseRight(0, y);
    };

    Terminal.prototype.blankLine = function(cur) {
        var attr = cur
            ? this.eraseAttr()
            : this.defAttr;

        var ch = [attr, ' ']
            , line = []
            , i = 0;

        for (; i < this.cols; i++) {
            line[i] = ch;
        }

        return line;
    };

    Terminal.prototype.ch = function(cur) {
        return cur
            ? [this.eraseAttr(), ' ']
            : [this.defAttr, ' '];
    };

    Terminal.prototype.is = function(term) {
        var name = this.termName;
        return (name + '').indexOf(term) === 0;
    };

    Terminal.prototype.handler = function(data) {
        this.emit('data', data);
    };

    Terminal.prototype.handleTitle = function(title) {
        this.emit('title', title);
    };

    /**
     * ESC
     */

// ESC D Index (IND is 0x84).
    Terminal.prototype.index = function() {
        this.y++;
        if (this.y > this.scrollBottom) {
            this.y--;
            this.scroll();
        }
        this.state = normal;
    };

// ESC M Reverse Index (RI is 0x8d).
    Terminal.prototype.reverseIndex = function() {
        var j;
        this.y--;
        if (this.y < this.scrollTop) {
            this.y++;
            // possibly move the code below to term.reverseScroll();
            // test: echo -ne '\e[1;1H\e[44m\eM\e[0m'
            // blankLine(true) is xterm/linux behavior
            this.lines.splice(this.y + this.ybase, 0, this.blankLine(true));
            j = this.rows - 1 - this.scrollBottom;
            this.lines.splice(this.rows - 1 + this.ybase - j + 1, 1);
            // this.maxRange();
            this.updateRange(this.scrollTop);
            this.updateRange(this.scrollBottom);
        }
        this.state = normal;
    };

// ESC c Full Reset (RIS).
    Terminal.prototype.reset = function() {
        this.options.rows = this.rows;
        this.options.cols = this.cols;
        Terminal.call(this, this.options);
        this.refresh(0, this.rows - 1);
    };

// ESC H Tab Set (HTS is 0x88).
    Terminal.prototype.tabSet = function() {
        this.tabs[this.x] = true;
        this.state = normal;
    };

    /**
     * CSI
     */

// CSI Ps A
// Cursor Up Ps Times (default = 1) (CUU).
    Terminal.prototype.cursorUp = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.y -= param;
        if (this.y < 0) this.y = 0;
    };

// CSI Ps B
// Cursor Down Ps Times (default = 1) (CUD).
    Terminal.prototype.cursorDown = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.y += param;
        if (this.y >= this.rows) {
            this.y = this.rows - 1;
        }
    };

// CSI Ps C
// Cursor Forward Ps Times (default = 1) (CUF).
    Terminal.prototype.cursorForward = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.x += param;
        if (this.x >= this.cols) {
            this.x = this.cols - 1;
        }
    };

// CSI Ps D
// Cursor Backward Ps Times (default = 1) (CUB).
    Terminal.prototype.cursorBackward = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.x -= param;
        if (this.x < 0) this.x = 0;
    };

// CSI Ps ; Ps H
// Cursor Position [row;column] (default = [1,1]) (CUP).
    Terminal.prototype.cursorPos = function(params) {
        var row, col;

        row = params[0] - 1;

        if (params.length >= 2) {
            col = params[1] - 1;
        } else {
            col = 0;
        }

        if (row < 0) {
            row = 0;
        } else if (row >= this.rows) {
            row = this.rows - 1;
        }

        if (col < 0) {
            col = 0;
        } else if (col >= this.cols) {
            col = this.cols - 1;
        }

        this.x = col;
        this.y = row;
    };

// CSI Ps J  Erase in Display (ED).
//     Ps = 0  -> Erase Below (default).
//     Ps = 1  -> Erase Above.
//     Ps = 2  -> Erase All.
//     Ps = 3  -> Erase Saved Lines (xterm).
// CSI ? Ps J
//   Erase in Display (DECSED).
//     Ps = 0  -> Selective Erase Below (default).
//     Ps = 1  -> Selective Erase Above.
//     Ps = 2  -> Selective Erase All.
    Terminal.prototype.eraseInDisplay = function(params) {
        var j;
        switch (params[0]) {
            case 0:
                this.eraseRight(this.x, this.y);
                j = this.y + 1;
                for (; j < this.rows; j++) {
                    this.eraseLine(j);
                }
                break;
            case 1:
                this.eraseLeft(this.x, this.y);
                j = this.y;
                while (j--) {
                    this.eraseLine(j);
                }
                break;
            case 2:
                j = this.rows;
                while (j--) this.eraseLine(j);
                break;
            case 3:
                ; // no saved lines
                break;
        }
    };

// CSI Ps K  Erase in Line (EL).
//     Ps = 0  -> Erase to Right (default).
//     Ps = 1  -> Erase to Left.
//     Ps = 2  -> Erase All.
// CSI ? Ps K
//   Erase in Line (DECSEL).
//     Ps = 0  -> Selective Erase to Right (default).
//     Ps = 1  -> Selective Erase to Left.
//     Ps = 2  -> Selective Erase All.
    Terminal.prototype.eraseInLine = function(params) {
        switch (params[0]) {
            case 0:
                this.eraseRight(this.x, this.y);
                break;
            case 1:
                this.eraseLeft(this.x, this.y);
                break;
            case 2:
                this.eraseLine(this.y);
                break;
        }
    };

// CSI Pm m  Character Attributes (SGR).
//     Ps = 0  -> Normal (default).
//     Ps = 1  -> Bold.
//     Ps = 4  -> Underlined.
//     Ps = 5  -> Blink (appears as Bold).
//     Ps = 7  -> Inverse.
//     Ps = 8  -> Invisible, i.e., hidden (VT300).
//     Ps = 2 2  -> Normal (neither bold nor faint).
//     Ps = 2 4  -> Not underlined.
//     Ps = 2 5  -> Steady (not blinking).
//     Ps = 2 7  -> Positive (not inverse).
//     Ps = 2 8  -> Visible, i.e., not hidden (VT300).
//     Ps = 3 0  -> Set foreground color to Black.
//     Ps = 3 1  -> Set foreground color to Red.
//     Ps = 3 2  -> Set foreground color to Green.
//     Ps = 3 3  -> Set foreground color to Yellow.
//     Ps = 3 4  -> Set foreground color to Blue.
//     Ps = 3 5  -> Set foreground color to Magenta.
//     Ps = 3 6  -> Set foreground color to Cyan.
//     Ps = 3 7  -> Set foreground color to White.
//     Ps = 3 9  -> Set foreground color to default (original).
//     Ps = 4 0  -> Set background color to Black.
//     Ps = 4 1  -> Set background color to Red.
//     Ps = 4 2  -> Set background color to Green.
//     Ps = 4 3  -> Set background color to Yellow.
//     Ps = 4 4  -> Set background color to Blue.
//     Ps = 4 5  -> Set background color to Magenta.
//     Ps = 4 6  -> Set background color to Cyan.
//     Ps = 4 7  -> Set background color to White.
//     Ps = 4 9  -> Set background color to default (original).

//   If 16-color support is compiled, the following apply.  Assume
//   that xterm's resources are set so that the ISO color codes are
//   the first 8 of a set of 16.  Then the aixterm colors are the
//   bright versions of the ISO colors:
//     Ps = 9 0  -> Set foreground color to Black.
//     Ps = 9 1  -> Set foreground color to Red.
//     Ps = 9 2  -> Set foreground color to Green.
//     Ps = 9 3  -> Set foreground color to Yellow.
//     Ps = 9 4  -> Set foreground color to Blue.
//     Ps = 9 5  -> Set foreground color to Magenta.
//     Ps = 9 6  -> Set foreground color to Cyan.
//     Ps = 9 7  -> Set foreground color to White.
//     Ps = 1 0 0  -> Set background color to Black.
//     Ps = 1 0 1  -> Set background color to Red.
//     Ps = 1 0 2  -> Set background color to Green.
//     Ps = 1 0 3  -> Set background color to Yellow.
//     Ps = 1 0 4  -> Set background color to Blue.
//     Ps = 1 0 5  -> Set background color to Magenta.
//     Ps = 1 0 6  -> Set background color to Cyan.
//     Ps = 1 0 7  -> Set background color to White.

//   If xterm is compiled with the 16-color support disabled, it
//   supports the following, from rxvt:
//     Ps = 1 0 0  -> Set foreground and background color to
//     default.

//   If 88- or 256-color support is compiled, the following apply.
//     Ps = 3 8  ; 5  ; Ps -> Set foreground color to the second
//     Ps.
//     Ps = 4 8  ; 5  ; Ps -> Set background color to the second
//     Ps.
    Terminal.prototype.charAttributes = function(params) {
        // Optimize a single SGR0.
        if (params.length === 1 && params[0] === 0) {
            this.curAttr = this.defAttr;
            return;
        }

        var l = params.length
            , i = 0
            , flags = this.curAttr >> 18
            , fg = (this.curAttr >> 9) & 0x1ff
            , bg = this.curAttr & 0x1ff
            , p;

        for (; i < l; i++) {
            p = params[i];
            if (p >= 30 && p <= 37) {
                // fg color 8
                fg = p - 30;
            } else if (p >= 40 && p <= 47) {
                // bg color 8
                bg = p - 40;
            } else if (p >= 90 && p <= 97) {
                // fg color 16
                p += 8;
                fg = p - 90;
            } else if (p >= 100 && p <= 107) {
                // bg color 16
                p += 8;
                bg = p - 100;
            } else if (p === 0) {
                // default
                flags = this.defAttr >> 18;
                fg = (this.defAttr >> 9) & 0x1ff;
                bg = this.defAttr & 0x1ff;
                // flags = 0;
                // fg = 0x1ff;
                // bg = 0x1ff;
            } else if (p === 1) {
                // bold text
                flags |= 1;
            } else if (p === 4) {
                // underlined text
                flags |= 2;
            } else if (p === 5) {
                // blink
                flags |= 4;
            } else if (p === 7) {
                // inverse and positive
                // test with: echo -e '\e[31m\e[42mhello\e[7mworld\e[27mhi\e[m'
                flags |= 8;
            } else if (p === 8) {
                // invisible
                flags |= 16;
            } else if (p === 22) {
                // not bold
                flags &= ~1;
            } else if (p === 24) {
                // not underlined
                flags &= ~2;
            } else if (p === 25) {
                // not blink
                flags &= ~4;
            } else if (p === 27) {
                // not inverse
                flags &= ~8;
            } else if (p === 28) {
                // not invisible
                flags &= ~16;
            } else if (p === 39) {
                // reset fg
                fg = (this.defAttr >> 9) & 0x1ff;
            } else if (p === 49) {
                // reset bg
                bg = this.defAttr & 0x1ff;
            } else if (p === 38) {
                // fg color 256
                if (params[i + 1] === 2) {
                    i += 2;
                    fg = matchColor(
                            params[i] & 0xff,
                            params[i + 1] & 0xff,
                            params[i + 2] & 0xff);
                    if (fg === -1) fg = 0x1ff;
                    i += 2;
                } else if (params[i + 1] === 5) {
                    i += 2;
                    p = params[i] & 0xff;
                    fg = p;
                }
            } else if (p === 48) {
                // bg color 256
                if (params[i + 1] === 2) {
                    i += 2;
                    bg = matchColor(
                            params[i] & 0xff,
                            params[i + 1] & 0xff,
                            params[i + 2] & 0xff);
                    if (bg === -1) bg = 0x1ff;
                    i += 2;
                } else if (params[i + 1] === 5) {
                    i += 2;
                    p = params[i] & 0xff;
                    bg = p;
                }
            } else if (p === 100) {
                // reset fg/bg
                fg = (this.defAttr >> 9) & 0x1ff;
                bg = this.defAttr & 0x1ff;
            } else {
                this.error('Unknown SGR attribute: %d.', p);
            }
        }

        this.curAttr = (flags << 18) | (fg << 9) | bg;
    };

// CSI Ps n  Device Status Report (DSR).
//     Ps = 5  -> Status Report.  Result (``OK'') is
//   CSI 0 n
//     Ps = 6  -> Report Cursor Position (CPR) [row;column].
//   Result is
//   CSI r ; c R
// CSI ? Ps n
//   Device Status Report (DSR, DEC-specific).
//     Ps = 6  -> Report Cursor Position (CPR) [row;column] as CSI
//     ? r ; c R (assumes page is zero).
//     Ps = 1 5  -> Report Printer status as CSI ? 1 0  n  (ready).
//     or CSI ? 1 1  n  (not ready).
//     Ps = 2 5  -> Report UDK status as CSI ? 2 0  n  (unlocked)
//     or CSI ? 2 1  n  (locked).
//     Ps = 2 6  -> Report Keyboard status as
//   CSI ? 2 7  ;  1  ;  0  ;  0  n  (North American).
//   The last two parameters apply to VT400 & up, and denote key-
//   board ready and LK01 respectively.
//     Ps = 5 3  -> Report Locator status as
//   CSI ? 5 3  n  Locator available, if compiled-in, or
//   CSI ? 5 0  n  No Locator, if not.
    Terminal.prototype.deviceStatus = function(params) {
        if (!this.prefix) {
            switch (params[0]) {
                case 5:
                    // status report
                    this.send('\x1b[0n');
                    break;
                case 6:
                    // cursor position
                    this.send('\x1b['
                        + (this.y + 1)
                        + ';'
                        + (this.x + 1)
                        + 'R');
                    break;
            }
        } else if (this.prefix === '?') {
            // modern xterm doesnt seem to
            // respond to any of these except ?6, 6, and 5
            switch (params[0]) {
                case 6:
                    // cursor position
                    this.send('\x1b[?'
                        + (this.y + 1)
                        + ';'
                        + (this.x + 1)
                        + 'R');
                    break;
                case 15:
                    // no printer
                    // this.send('\x1b[?11n');
                    break;
                case 25:
                    // dont support user defined keys
                    // this.send('\x1b[?21n');
                    break;
                case 26:
                    // north american keyboard
                    // this.send('\x1b[?27;1;0;0n');
                    break;
                case 53:
                    // no dec locator/mouse
                    // this.send('\x1b[?50n');
                    break;
            }
        }
    };

    /**
     * Additions
     */

// CSI Ps @
// Insert Ps (Blank) Character(s) (default = 1) (ICH).
    Terminal.prototype.insertChars = function(params) {
        var param, row, j, ch;

        param = params[0];
        if (param < 1) param = 1;

        row = this.y + this.ybase;
        j = this.x;
        ch = [this.eraseAttr(), ' ']; // xterm

        while (param-- && j < this.cols) {
            this.lines[row].splice(j++, 0, ch);
            this.lines[row].pop();
        }
    };

// CSI Ps E
// Cursor Next Line Ps Times (default = 1) (CNL).
// same as CSI Ps B ?
    Terminal.prototype.cursorNextLine = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.y += param;
        if (this.y >= this.rows) {
            this.y = this.rows - 1;
        }
        this.x = 0;
    };

// CSI Ps F
// Cursor Preceding Line Ps Times (default = 1) (CNL).
// reuse CSI Ps A ?
    Terminal.prototype.cursorPrecedingLine = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.y -= param;
        if (this.y < 0) this.y = 0;
        this.x = 0;
    };

// CSI Ps G
// Cursor Character Absolute  [column] (default = [row,1]) (CHA).
    Terminal.prototype.cursorCharAbsolute = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.x = param - 1;
    };

// CSI Ps L
// Insert Ps Line(s) (default = 1) (IL).
    Terminal.prototype.insertLines = function(params) {
        var param, row, j;

        param = params[0];
        if (param < 1) param = 1;
        row = this.y + this.ybase;

        j = this.rows - 1 - this.scrollBottom;
        j = this.rows - 1 + this.ybase - j + 1;

        while (param--) {
            // test: echo -e '\e[44m\e[1L\e[0m'
            // blankLine(true) - xterm/linux behavior
            this.lines.splice(row, 0, this.blankLine(true));
            this.lines.splice(j, 1);
        }

        // this.maxRange();
        this.updateRange(this.y);
        this.updateRange(this.scrollBottom);
    };

// CSI Ps M
// Delete Ps Line(s) (default = 1) (DL).
    Terminal.prototype.deleteLines = function(params) {
        var param, row, j;

        param = params[0];
        if (param < 1) param = 1;
        row = this.y + this.ybase;

        j = this.rows - 1 - this.scrollBottom;
        j = this.rows - 1 + this.ybase - j;

        while (param--) {
            // test: echo -e '\e[44m\e[1M\e[0m'
            // blankLine(true) - xterm/linux behavior
            this.lines.splice(j + 1, 0, this.blankLine(true));
            this.lines.splice(row, 1);
        }

        // this.maxRange();
        this.updateRange(this.y);
        this.updateRange(this.scrollBottom);
    };

// CSI Ps P
// Delete Ps Character(s) (default = 1) (DCH).
    Terminal.prototype.deleteChars = function(params) {
        var param, row, ch;

        param = params[0];
        if (param < 1) param = 1;

        row = this.y + this.ybase;
        ch = [this.eraseAttr(), ' ']; // xterm

        while (param--) {
            this.lines[row].splice(this.x, 1);
            this.lines[row].push(ch);
        }
    };

// CSI Ps X
// Erase Ps Character(s) (default = 1) (ECH).
    Terminal.prototype.eraseChars = function(params) {
        var param, row, j, ch;

        param = params[0];
        if (param < 1) param = 1;

        row = this.y + this.ybase;
        j = this.x;
        ch = [this.eraseAttr(), ' ']; // xterm

        while (param-- && j < this.cols) {
            this.lines[row][j++] = ch;
        }
    };

// CSI Pm `  Character Position Absolute
//   [column] (default = [row,1]) (HPA).
    Terminal.prototype.charPosAbsolute = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.x = param - 1;
        if (this.x >= this.cols) {
            this.x = this.cols - 1;
        }
    };

// 141 61 a * HPR -
// Horizontal Position Relative
// reuse CSI Ps C ?
    Terminal.prototype.HPositionRelative = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.x += param;
        if (this.x >= this.cols) {
            this.x = this.cols - 1;
        }
    };

// CSI Ps c  Send Device Attributes (Primary DA).
//     Ps = 0  or omitted -> request attributes from terminal.  The
//     response depends on the decTerminalID resource setting.
//     -> CSI ? 1 ; 2 c  (``VT100 with Advanced Video Option'')
//     -> CSI ? 1 ; 0 c  (``VT101 with No Options'')
//     -> CSI ? 6 c  (``VT102'')
//     -> CSI ? 6 0 ; 1 ; 2 ; 6 ; 8 ; 9 ; 1 5 ; c  (``VT220'')
//   The VT100-style response parameters do not mean anything by
//   themselves.  VT220 parameters do, telling the host what fea-
//   tures the terminal supports:
//     Ps = 1  -> 132-columns.
//     Ps = 2  -> Printer.
//     Ps = 6  -> Selective erase.
//     Ps = 8  -> User-defined keys.
//     Ps = 9  -> National replacement character sets.
//     Ps = 1 5  -> Technical characters.
//     Ps = 2 2  -> ANSI color, e.g., VT525.
//     Ps = 2 9  -> ANSI text locator (i.e., DEC Locator mode).
// CSI > Ps c
//   Send Device Attributes (Secondary DA).
//     Ps = 0  or omitted -> request the terminal's identification
//     code.  The response depends on the decTerminalID resource set-
//     ting.  It should apply only to VT220 and up, but xterm extends
//     this to VT100.
//     -> CSI  > Pp ; Pv ; Pc c
//   where Pp denotes the terminal type
//     Pp = 0  -> ``VT100''.
//     Pp = 1  -> ``VT220''.
//   and Pv is the firmware version (for xterm, this was originally
//   the XFree86 patch number, starting with 95).  In a DEC termi-
//   nal, Pc indicates the ROM cartridge registration number and is
//   always zero.
// More information:
//   xterm/charproc.c - line 2012, for more information.
//   vim responds with ^[[?0c or ^[[?1c after the terminal's response (?)
    Terminal.prototype.sendDeviceAttributes = function(params) {
        if (params[0] > 0) return;

        if (!this.prefix) {
            if (this.is('xterm')
                || this.is('rxvt-unicode')
                || this.is('screen')) {
                this.send('\x1b[?1;2c');
            } else if (this.is('linux')) {
                this.send('\x1b[?6c');
            }
        } else if (this.prefix === '>') {
            // xterm and urxvt
            // seem to spit this
            // out around ~370 times (?).
            if (this.is('xterm')) {
                this.send('\x1b[>0;276;0c');
            } else if (this.is('rxvt-unicode')) {
                this.send('\x1b[>85;95;0c');
            } else if (this.is('linux')) {
                // not supported by linux console.
                // linux console echoes parameters.
                this.send(params[0] + 'c');
            } else if (this.is('screen')) {
                this.send('\x1b[>83;40003;0c');
            }
        }
    };

// CSI Pm d
// Line Position Absolute  [row] (default = [1,column]) (VPA).
    Terminal.prototype.linePosAbsolute = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.y = param - 1;
        if (this.y >= this.rows) {
            this.y = this.rows - 1;
        }
    };

// 145 65 e * VPR - Vertical Position Relative
// reuse CSI Ps B ?
    Terminal.prototype.VPositionRelative = function(params) {
        var param = params[0];
        if (param < 1) param = 1;
        this.y += param;
        if (this.y >= this.rows) {
            this.y = this.rows - 1;
        }
    };

// CSI Ps ; Ps f
//   Horizontal and Vertical Position [row;column] (default =
//   [1,1]) (HVP).
    Terminal.prototype.HVPosition = function(params) {
        if (params[0] < 1) params[0] = 1;
        if (params[1] < 1) params[1] = 1;

        this.y = params[0] - 1;
        if (this.y >= this.rows) {
            this.y = this.rows - 1;
        }

        this.x = params[1] - 1;
        if (this.x >= this.cols) {
            this.x = this.cols - 1;
        }
    };

// CSI Pm h  Set Mode (SM).
//     Ps = 2  -> Keyboard Action Mode (AM).
//     Ps = 4  -> Insert Mode (IRM).
//     Ps = 1 2  -> Send/receive (SRM).
//     Ps = 2 0  -> Automatic Newline (LNM).
// CSI ? Pm h
//   DEC Private Mode Set (DECSET).
//     Ps = 1  -> Application Cursor Keys (DECCKM).
//     Ps = 2  -> Designate USASCII for character sets G0-G3
//     (DECANM), and set VT100 mode.
//     Ps = 3  -> 132 Column Mode (DECCOLM).
//     Ps = 4  -> Smooth (Slow) Scroll (DECSCLM).
//     Ps = 5  -> Reverse Video (DECSCNM).
//     Ps = 6  -> Origin Mode (DECOM).
//     Ps = 7  -> Wraparound Mode (DECAWM).
//     Ps = 8  -> Auto-repeat Keys (DECARM).
//     Ps = 9  -> Send Mouse X & Y on button press.  See the sec-
//     tion Mouse Tracking.
//     Ps = 1 0  -> Show toolbar (rxvt).
//     Ps = 1 2  -> Start Blinking Cursor (att610).
//     Ps = 1 8  -> Print form feed (DECPFF).
//     Ps = 1 9  -> Set print extent to full screen (DECPEX).
//     Ps = 2 5  -> Show Cursor (DECTCEM).
//     Ps = 3 0  -> Show scrollbar (rxvt).
//     Ps = 3 5  -> Enable font-shifting functions (rxvt).
//     Ps = 3 8  -> Enter Tektronix Mode (DECTEK).
//     Ps = 4 0  -> Allow 80 -> 132 Mode.
//     Ps = 4 1  -> more(1) fix (see curses resource).
//     Ps = 4 2  -> Enable Nation Replacement Character sets (DECN-
//     RCM).
//     Ps = 4 4  -> Turn On Margin Bell.
//     Ps = 4 5  -> Reverse-wraparound Mode.
//     Ps = 4 6  -> Start Logging.  This is normally disabled by a
//     compile-time option.
//     Ps = 4 7  -> Use Alternate Screen Buffer.  (This may be dis-
//     abled by the titeInhibit resource).
//     Ps = 6 6  -> Application keypad (DECNKM).
//     Ps = 6 7  -> Backarrow key sends backspace (DECBKM).
//     Ps = 1 0 0 0  -> Send Mouse X & Y on button press and
//     release.  See the section Mouse Tracking.
//     Ps = 1 0 0 1  -> Use Hilite Mouse Tracking.
//     Ps = 1 0 0 2  -> Use Cell Motion Mouse Tracking.
//     Ps = 1 0 0 3  -> Use All Motion Mouse Tracking.
//     Ps = 1 0 0 4  -> Send FocusIn/FocusOut events.
//     Ps = 1 0 0 5  -> Enable Extended Mouse Mode.
//     Ps = 1 0 1 0  -> Scroll to bottom on tty output (rxvt).
//     Ps = 1 0 1 1  -> Scroll to bottom on key press (rxvt).
//     Ps = 1 0 3 4  -> Interpret "meta" key, sets eighth bit.
//     (enables the eightBitInput resource).
//     Ps = 1 0 3 5  -> Enable special modifiers for Alt and Num-
//     Lock keys.  (This enables the numLock resource).
//     Ps = 1 0 3 6  -> Send ESC   when Meta modifies a key.  (This
//     enables the metaSendsEscape resource).
//     Ps = 1 0 3 7  -> Send DEL from the editing-keypad Delete
//     key.
//     Ps = 1 0 3 9  -> Send ESC  when Alt modifies a key.  (This
//     enables the altSendsEscape resource).
//     Ps = 1 0 4 0  -> Keep selection even if not highlighted.
//     (This enables the keepSelection resource).
//     Ps = 1 0 4 1  -> Use the CLIPBOARD selection.  (This enables
//     the selectToClipboard resource).
//     Ps = 1 0 4 2  -> Enable Urgency window manager hint when
//     Control-G is received.  (This enables the bellIsUrgent
//     resource).
//     Ps = 1 0 4 3  -> Enable raising of the window when Control-G
//     is received.  (enables the popOnBell resource).
//     Ps = 1 0 4 7  -> Use Alternate Screen Buffer.  (This may be
//     disabled by the titeInhibit resource).
//     Ps = 1 0 4 8  -> Save cursor as in DECSC.  (This may be dis-
//     abled by the titeInhibit resource).
//     Ps = 1 0 4 9  -> Save cursor as in DECSC and use Alternate
//     Screen Buffer, clearing it first.  (This may be disabled by
//     the titeInhibit resource).  This combines the effects of the 1
//     0 4 7  and 1 0 4 8  modes.  Use this with terminfo-based
//     applications rather than the 4 7  mode.
//     Ps = 1 0 5 0  -> Set terminfo/termcap function-key mode.
//     Ps = 1 0 5 1  -> Set Sun function-key mode.
//     Ps = 1 0 5 2  -> Set HP function-key mode.
//     Ps = 1 0 5 3  -> Set SCO function-key mode.
//     Ps = 1 0 6 0  -> Set legacy keyboard emulation (X11R6).
//     Ps = 1 0 6 1  -> Set VT220 keyboard emulation.
//     Ps = 2 0 0 4  -> Set bracketed paste mode.
// Modes:
//   http://vt100.net/docs/vt220-rm/chapter4.html
    Terminal.prototype.setMode = function(params) {
        if (typeof params === 'object') {
            var l = params.length
                , i = 0;

            for (; i < l; i++) {
                this.setMode(params[i]);
            }

            return;
        }

        if (!this.prefix) {
            switch (params) {
                case 4:
                    this.insertMode = true;
                    break;
                case 20:
                    //this.convertEol = true;
                    break;
            }
        } else if (this.prefix === '?') {
            switch (params) {
                case 1:
                    this.applicationCursor = true;
                    break;
                case 2:
                    this.setgCharset(0, Terminal.charsets.US);
                    this.setgCharset(1, Terminal.charsets.US);
                    this.setgCharset(2, Terminal.charsets.US);
                    this.setgCharset(3, Terminal.charsets.US);
                    // set VT100 mode here
                    break;
                case 3: // 132 col mode
                    this.savedCols = this.cols;
                    this.resize(132, this.rows);
                    break;
                case 6:
                    this.originMode = true;
                    break;
                case 7:
                    this.wraparoundMode = true;
                    break;
                case 12:
                    // this.cursorBlink = true;
                    break;
                case 66:
                    this.log('Serial port requested application keypad.');
                    this.applicationKeypad = true;
                    break;
                case 9: // X10 Mouse
                // no release, no motion, no wheel, no modifiers.
                case 1000: // vt200 mouse
                // no motion.
                // no modifiers, except control on the wheel.
                case 1002: // button event mouse
                case 1003: // any event mouse
                    // any event - sends motion events,
                    // even if there is no button held down.
                    this.x10Mouse = params === 9;
                    this.vt200Mouse = params === 1000;
                    this.normalMouse = params > 1000;
                    this.mouseEvents = true;
                    this.element.style.cursor = 'default';
                    this.log('Binding to mouse events.');
                    break;
                case 1004: // send focusin/focusout events
                    // focusin: ^[[I
                    // focusout: ^[[O
                    this.sendFocus = true;
                    break;
                case 1005: // utf8 ext mode mouse
                    this.utfMouse = true;
                    // for wide terminals
                    // simply encodes large values as utf8 characters
                    break;
                case 1006: // sgr ext mode mouse
                    this.sgrMouse = true;
                    // for wide terminals
                    // does not add 32 to fields
                    // press: ^[[<b;x;yM
                    // release: ^[[<b;x;ym
                    break;
                case 1015: // urxvt ext mode mouse
                    this.urxvtMouse = true;
                    // for wide terminals
                    // numbers for fields
                    // press: ^[[b;x;yM
                    // motion: ^[[b;x;yT
                    break;
                case 25: // show cursor
                    this.cursorHidden = false;
                    break;
                case 1049: // alt screen buffer cursor
                    //this.saveCursor();
                    ; // FALL-THROUGH
                case 47: // alt screen buffer
                case 1047: // alt screen buffer
                    if (!this.normal) {
                        var normal = {
                            lines: this.lines,
                            ybase: this.ybase,
                            ydisp: this.ydisp,
                            x: this.x,
                            y: this.y,
                            scrollTop: this.scrollTop,
                            scrollBottom: this.scrollBottom,
                            tabs: this.tabs
                            // XXX save charset(s) here?
                            // charset: this.charset,
                            // glevel: this.glevel,
                            // charsets: this.charsets
                        };
                        this.reset();
                        this.normal = normal;
                        this.showCursor();
                    }
                    break;
            }
        }
    };

// CSI Pm l  Reset Mode (RM).
//     Ps = 2  -> Keyboard Action Mode (AM).
//     Ps = 4  -> Replace Mode (IRM).
//     Ps = 1 2  -> Send/receive (SRM).
//     Ps = 2 0  -> Normal Linefeed (LNM).
// CSI ? Pm l
//   DEC Private Mode Reset (DECRST).
//     Ps = 1  -> Normal Cursor Keys (DECCKM).
//     Ps = 2  -> Designate VT52 mode (DECANM).
//     Ps = 3  -> 80 Column Mode (DECCOLM).
//     Ps = 4  -> Jump (Fast) Scroll (DECSCLM).
//     Ps = 5  -> Normal Video (DECSCNM).
//     Ps = 6  -> Normal Cursor Mode (DECOM).
//     Ps = 7  -> No Wraparound Mode (DECAWM).
//     Ps = 8  -> No Auto-repeat Keys (DECARM).
//     Ps = 9  -> Don't send Mouse X & Y on button press.
//     Ps = 1 0  -> Hide toolbar (rxvt).
//     Ps = 1 2  -> Stop Blinking Cursor (att610).
//     Ps = 1 8  -> Don't print form feed (DECPFF).
//     Ps = 1 9  -> Limit print to scrolling region (DECPEX).
//     Ps = 2 5  -> Hide Cursor (DECTCEM).
//     Ps = 3 0  -> Don't show scrollbar (rxvt).
//     Ps = 3 5  -> Disable font-shifting functions (rxvt).
//     Ps = 4 0  -> Disallow 80 -> 132 Mode.
//     Ps = 4 1  -> No more(1) fix (see curses resource).
//     Ps = 4 2  -> Disable Nation Replacement Character sets (DEC-
//     NRCM).
//     Ps = 4 4  -> Turn Off Margin Bell.
//     Ps = 4 5  -> No Reverse-wraparound Mode.
//     Ps = 4 6  -> Stop Logging.  (This is normally disabled by a
//     compile-time option).
//     Ps = 4 7  -> Use Normal Screen Buffer.
//     Ps = 6 6  -> Numeric keypad (DECNKM).
//     Ps = 6 7  -> Backarrow key sends delete (DECBKM).
//     Ps = 1 0 0 0  -> Don't send Mouse X & Y on button press and
//     release.  See the section Mouse Tracking.
//     Ps = 1 0 0 1  -> Don't use Hilite Mouse Tracking.
//     Ps = 1 0 0 2  -> Don't use Cell Motion Mouse Tracking.
//     Ps = 1 0 0 3  -> Don't use All Motion Mouse Tracking.
//     Ps = 1 0 0 4  -> Don't send FocusIn/FocusOut events.
//     Ps = 1 0 0 5  -> Disable Extended Mouse Mode.
//     Ps = 1 0 1 0  -> Don't scroll to bottom on tty output
//     (rxvt).
//     Ps = 1 0 1 1  -> Don't scroll to bottom on key press (rxvt).
//     Ps = 1 0 3 4  -> Don't interpret "meta" key.  (This disables
//     the eightBitInput resource).
//     Ps = 1 0 3 5  -> Disable special modifiers for Alt and Num-
//     Lock keys.  (This disables the numLock resource).
//     Ps = 1 0 3 6  -> Don't send ESC  when Meta modifies a key.
//     (This disables the metaSendsEscape resource).
//     Ps = 1 0 3 7  -> Send VT220 Remove from the editing-keypad
//     Delete key.
//     Ps = 1 0 3 9  -> Don't send ESC  when Alt modifies a key.
//     (This disables the altSendsEscape resource).
//     Ps = 1 0 4 0  -> Do not keep selection when not highlighted.
//     (This disables the keepSelection resource).
//     Ps = 1 0 4 1  -> Use the PRIMARY selection.  (This disables
//     the selectToClipboard resource).
//     Ps = 1 0 4 2  -> Disable Urgency window manager hint when
//     Control-G is received.  (This disables the bellIsUrgent
//     resource).
//     Ps = 1 0 4 3  -> Disable raising of the window when Control-
//     G is received.  (This disables the popOnBell resource).
//     Ps = 1 0 4 7  -> Use Normal Screen Buffer, clearing screen
//     first if in the Alternate Screen.  (This may be disabled by
//     the titeInhibit resource).
//     Ps = 1 0 4 8  -> Restore cursor as in DECRC.  (This may be
//     disabled by the titeInhibit resource).
//     Ps = 1 0 4 9  -> Use Normal Screen Buffer and restore cursor
//     as in DECRC.  (This may be disabled by the titeInhibit
//     resource).  This combines the effects of the 1 0 4 7  and 1 0
//     4 8  modes.  Use this with terminfo-based applications rather
//     than the 4 7  mode.
//     Ps = 1 0 5 0  -> Reset terminfo/termcap function-key mode.
//     Ps = 1 0 5 1  -> Reset Sun function-key mode.
//     Ps = 1 0 5 2  -> Reset HP function-key mode.
//     Ps = 1 0 5 3  -> Reset SCO function-key mode.
//     Ps = 1 0 6 0  -> Reset legacy keyboard emulation (X11R6).
//     Ps = 1 0 6 1  -> Reset keyboard emulation to Sun/PC style.
//     Ps = 2 0 0 4  -> Reset bracketed paste mode.
    Terminal.prototype.resetMode = function(params) {
        if (typeof params === 'object') {
            var l = params.length
                , i = 0;

            for (; i < l; i++) {
                this.resetMode(params[i]);
            }

            return;
        }

        if (!this.prefix) {
            switch (params) {
                case 4:
                    this.insertMode = false;
                    break;
                case 20:
                    //this.convertEol = false;
                    break;
            }
        } else if (this.prefix === '?') {
            switch (params) {
                case 1:
                    this.applicationCursor = false;
                    break;
                case 3:
                    if (this.cols === 132 && this.savedCols) {
                        this.resize(this.savedCols, this.rows);
                    }
                    delete this.savedCols;
                    break;
                case 6:
                    this.originMode = false;
                    break;
                case 7:
                    this.wraparoundMode = false;
                    break;
                case 12:
                    // this.cursorBlink = false;
                    break;
                case 66:
                    this.log('Switching back to normal keypad.');
                    this.applicationKeypad = false;
                    break;
                case 9: // X10 Mouse
                case 1000: // vt200 mouse
                case 1002: // button event mouse
                case 1003: // any event mouse
                    this.x10Mouse = false;
                    this.vt200Mouse = false;
                    this.normalMouse = false;
                    this.mouseEvents = false;
                    this.element.style.cursor = '';
                    break;
                case 1004: // send focusin/focusout events
                    this.sendFocus = false;
                    break;
                case 1005: // utf8 ext mode mouse
                    this.utfMouse = false;
                    break;
                case 1006: // sgr ext mode mouse
                    this.sgrMouse = false;
                    break;
                case 1015: // urxvt ext mode mouse
                    this.urxvtMouse = false;
                    break;
                case 25: // hide cursor
                    this.cursorHidden = true;
                    break;
                case 1049: // alt screen buffer cursor
                    ; // FALL-THROUGH
                case 47: // normal screen buffer
                case 1047: // normal screen buffer - clearing it first
                    if (this.normal) {
                        this.lines = this.normal.lines;
                        this.ybase = this.normal.ybase;
                        this.ydisp = this.normal.ydisp;
                        this.x = this.normal.x;
                        this.y = this.normal.y;
                        this.scrollTop = this.normal.scrollTop;
                        this.scrollBottom = this.normal.scrollBottom;
                        this.tabs = this.normal.tabs;
                        this.normal = null;
                        // if (params === 1049) {
                        //   this.x = this.savedX;
                        //   this.y = this.savedY;
                        // }
                        this.refresh(0, this.rows - 1);
                        this.showCursor();
                    }
                    break;
            }
        }
    };

// CSI Ps ; Ps r
//   Set Scrolling Region [top;bottom] (default = full size of win-
//   dow) (DECSTBM).
// CSI ? Pm r
    Terminal.prototype.setScrollRegion = function(params) {
        if (this.prefix) return;
        this.scrollTop = (params[0] || 1) - 1;
        this.scrollBottom = (params[1] || this.rows) - 1;
        this.x = 0;
        this.y = 0;
    };

// CSI s
//   Save cursor (ANSI.SYS).
    Terminal.prototype.saveCursor = function(params) {
        this.savedX = this.x;
        this.savedY = this.y;
    };

// CSI u
//   Restore cursor (ANSI.SYS).
    Terminal.prototype.restoreCursor = function(params) {
        this.x = this.savedX || 0;
        this.y = this.savedY || 0;
    };

    /**
     * Lesser Used
     */

// CSI Ps I
//   Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
    Terminal.prototype.cursorForwardTab = function(params) {
        var param = params[0] || 1;
        while (param--) {
            this.x = this.nextStop();
        }
    };

// CSI Ps S  Scroll up Ps lines (default = 1) (SU).
    Terminal.prototype.scrollUp = function(params) {
        var param = params[0] || 1;
        while (param--) {
            this.lines.splice(this.ybase + this.scrollTop, 1);
            this.lines.splice(this.ybase + this.scrollBottom, 0, this.blankLine());
        }
        // this.maxRange();
        this.updateRange(this.scrollTop);
        this.updateRange(this.scrollBottom);
    };

// CSI Ps T  Scroll down Ps lines (default = 1) (SD).
    Terminal.prototype.scrollDown = function(params) {
        var param = params[0] || 1;
        while (param--) {
            this.lines.splice(this.ybase + this.scrollBottom, 1);
            this.lines.splice(this.ybase + this.scrollTop, 0, this.blankLine());
        }
        // this.maxRange();
        this.updateRange(this.scrollTop);
        this.updateRange(this.scrollBottom);
    };

// CSI Ps ; Ps ; Ps ; Ps ; Ps T
//   Initiate highlight mouse tracking.  Parameters are
//   [func;startx;starty;firstrow;lastrow].  See the section Mouse
//   Tracking.
    Terminal.prototype.initMouseTracking = function(params) {
        // Relevant: DECSET 1001
    };

// CSI > Ps; Ps T
//   Reset one or more features of the title modes to the default
//   value.  Normally, "reset" disables the feature.  It is possi-
//   ble to disable the ability to reset features by compiling a
//   different default for the title modes into xterm.
//     Ps = 0  -> Do not set window/icon labels using hexadecimal.
//     Ps = 1  -> Do not query window/icon labels using hexadeci-
//     mal.
//     Ps = 2  -> Do not set window/icon labels using UTF-8.
//     Ps = 3  -> Do not query window/icon labels using UTF-8.
//   (See discussion of "Title Modes").
    Terminal.prototype.resetTitleModes = function(params) {
        ;
    };

// CSI Ps Z  Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
    Terminal.prototype.cursorBackwardTab = function(params) {
        var param = params[0] || 1;
        while (param--) {
            this.x = this.prevStop();
        }
    };

// CSI Ps b  Repeat the preceding graphic character Ps times (REP).
    Terminal.prototype.repeatPrecedingCharacter = function(params) {
        var param = params[0] || 1
            , line = this.lines[this.ybase + this.y]
            , ch = line[this.x - 1] || [this.defAttr, ' '];

        while (param--) line[this.x++] = ch;
    };

// CSI Ps g  Tab Clear (TBC).
//     Ps = 0  -> Clear Current Column (default).
//     Ps = 3  -> Clear All.
// Potentially:
//   Ps = 2  -> Clear Stops on Line.
//   http://vt100.net/annarbor/aaa-ug/section6.html
    Terminal.prototype.tabClear = function(params) {
        var param = params[0];
        if (param <= 0) {
            delete this.tabs[this.x];
        } else if (param === 3) {
            this.tabs = {};
        }
    };

// CSI Pm i  Media Copy (MC).
//     Ps = 0  -> Print screen (default).
//     Ps = 4  -> Turn off printer controller mode.
//     Ps = 5  -> Turn on printer controller mode.
// CSI ? Pm i
//   Media Copy (MC, DEC-specific).
//     Ps = 1  -> Print line containing cursor.
//     Ps = 4  -> Turn off autoprint mode.
//     Ps = 5  -> Turn on autoprint mode.
//     Ps = 1  0  -> Print composed display, ignores DECPEX.
//     Ps = 1  1  -> Print all pages.
    Terminal.prototype.mediaCopy = function(params) {
        ;
    };

// CSI > Ps; Ps m
//   Set or reset resource-values used by xterm to decide whether
//   to construct escape sequences holding information about the
//   modifiers pressed with a given key.  The first parameter iden-
//   tifies the resource to set/reset.  The second parameter is the
//   value to assign to the resource.  If the second parameter is
//   omitted, the resource is reset to its initial value.
//     Ps = 1  -> modifyCursorKeys.
//     Ps = 2  -> modifyFunctionKeys.
//     Ps = 4  -> modifyOtherKeys.
//   If no parameters are given, all resources are reset to their
//   initial values.
    Terminal.prototype.setResources = function(params) {
        ;
    };

// CSI > Ps n
//   Disable modifiers which may be enabled via the CSI > Ps; Ps m
//   sequence.  This corresponds to a resource value of "-1", which
//   cannot be set with the other sequence.  The parameter identi-
//   fies the resource to be disabled:
//     Ps = 1  -> modifyCursorKeys.
//     Ps = 2  -> modifyFunctionKeys.
//     Ps = 4  -> modifyOtherKeys.
//   If the parameter is omitted, modifyFunctionKeys is disabled.
//   When modifyFunctionKeys is disabled, xterm uses the modifier
//   keys to make an extended sequence of functions rather than
//   adding a parameter to each function key to denote the modi-
//   fiers.
    Terminal.prototype.disableModifiers = function(params) {
        ;
    };

// CSI > Ps p
//   Set resource value pointerMode.  This is used by xterm to
//   decide whether to hide the pointer cursor as the user types.
//   Valid values for the parameter:
//     Ps = 0  -> never hide the pointer.
//     Ps = 1  -> hide if the mouse tracking mode is not enabled.
//     Ps = 2  -> always hide the pointer.  If no parameter is
//     given, xterm uses the default, which is 1 .
    Terminal.prototype.setPointerMode = function(params) {
        ;
    };

// CSI ! p   Soft terminal reset (DECSTR).
// http://vt100.net/docs/vt220-rm/table4-10.html
    Terminal.prototype.softReset = function(params) {
        this.cursorHidden = false;
        this.insertMode = false;
        this.originMode = false;
        this.wraparoundMode = false; // autowrap
        this.applicationKeypad = false; // ?
        this.applicationCursor = false;
        this.scrollTop = 0;
        this.scrollBottom = this.rows - 1;
        this.curAttr = this.defAttr;
        this.x = this.y = 0; // ?
        this.charset = null;
        this.glevel = 0; // ??
        this.charsets = [null]; // ??
    };

// CSI Ps$ p
//   Request ANSI mode (DECRQM).  For VT300 and up, reply is
//     CSI Ps; Pm$ y
//   where Ps is the mode number as in RM, and Pm is the mode
//   value:
//     0 - not recognized
//     1 - set
//     2 - reset
//     3 - permanently set
//     4 - permanently reset
    Terminal.prototype.requestAnsiMode = function(params) {
        ;
    };

// CSI ? Ps$ p
//   Request DEC private mode (DECRQM).  For VT300 and up, reply is
//     CSI ? Ps; Pm$ p
//   where Ps is the mode number as in DECSET, Pm is the mode value
//   as in the ANSI DECRQM.
    Terminal.prototype.requestPrivateMode = function(params) {
        ;
    };

// CSI Ps ; Ps " p
//   Set conformance level (DECSCL).  Valid values for the first
//   parameter:
//     Ps = 6 1  -> VT100.
//     Ps = 6 2  -> VT200.
//     Ps = 6 3  -> VT300.
//   Valid values for the second parameter:
//     Ps = 0  -> 8-bit controls.
//     Ps = 1  -> 7-bit controls (always set for VT100).
//     Ps = 2  -> 8-bit controls.
    Terminal.prototype.setConformanceLevel = function(params) {
        ;
    };

// CSI Ps q  Load LEDs (DECLL).
//     Ps = 0  -> Clear all LEDS (default).
//     Ps = 1  -> Light Num Lock.
//     Ps = 2  -> Light Caps Lock.
//     Ps = 3  -> Light Scroll Lock.
//     Ps = 2  1  -> Extinguish Num Lock.
//     Ps = 2  2  -> Extinguish Caps Lock.
//     Ps = 2  3  -> Extinguish Scroll Lock.
    Terminal.prototype.loadLEDs = function(params) {
        ;
    };

// CSI Ps SP q
//   Set cursor style (DECSCUSR, VT520).
//     Ps = 0  -> blinking block.
//     Ps = 1  -> blinking block (default).
//     Ps = 2  -> steady block.
//     Ps = 3  -> blinking underline.
//     Ps = 4  -> steady underline.
    Terminal.prototype.setCursorStyle = function(params) {
        ;
    };

// CSI Ps " q
//   Select character protection attribute (DECSCA).  Valid values
//   for the parameter:
//     Ps = 0  -> DECSED and DECSEL can erase (default).
//     Ps = 1  -> DECSED and DECSEL cannot erase.
//     Ps = 2  -> DECSED and DECSEL can erase.
    Terminal.prototype.setCharProtectionAttr = function(params) {
        ;
    };

// CSI ? Pm r
//   Restore DEC Private Mode Values.  The value of Ps previously
//   saved is restored.  Ps values are the same as for DECSET.
    Terminal.prototype.restorePrivateValues = function(params) {
        ;
    };

// CSI Pt; Pl; Pb; Pr; Ps$ r
//   Change Attributes in Rectangular Area (DECCARA), VT400 and up.
//     Pt; Pl; Pb; Pr denotes the rectangle.
//     Ps denotes the SGR attributes to change: 0, 1, 4, 5, 7.
// NOTE: xterm doesn't enable this code by default.
    Terminal.prototype.setAttrInRectangle = function(params) {
        var t = params[0]
            , l = params[1]
            , b = params[2]
            , r = params[3]
            , attr = params[4];

        var line
            , i;

        for (; t < b + 1; t++) {
            line = this.lines[this.ybase + t];
            for (i = l; i < r; i++) {
                line[i] = [attr, line[i][1]];
            }
        }

        // this.maxRange();
        this.updateRange(params[0]);
        this.updateRange(params[2]);
    };

// CSI ? Pm s
//   Save DEC Private Mode Values.  Ps values are the same as for
//   DECSET.
    Terminal.prototype.savePrivateValues = function(params) {
        ;
    };

// CSI Ps ; Ps ; Ps t
//   Window manipulation (from dtterm, as well as extensions).
//   These controls may be disabled using the allowWindowOps
//   resource.  Valid values for the first (and any additional
//   parameters) are:
//     Ps = 1  -> De-iconify window.
//     Ps = 2  -> Iconify window.
//     Ps = 3  ;  x ;  y -> Move window to [x, y].
//     Ps = 4  ;  height ;  width -> Resize the xterm window to
//     height and width in pixels.
//     Ps = 5  -> Raise the xterm window to the front of the stack-
//     ing order.
//     Ps = 6  -> Lower the xterm window to the bottom of the
//     stacking order.
//     Ps = 7  -> Refresh the xterm window.
//     Ps = 8  ;  height ;  width -> Resize the text area to
//     [height;width] in characters.
//     Ps = 9  ;  0  -> Restore maximized window.
//     Ps = 9  ;  1  -> Maximize window (i.e., resize to screen
//     size).
//     Ps = 1 0  ;  0  -> Undo full-screen mode.
//     Ps = 1 0  ;  1  -> Change to full-screen.
//     Ps = 1 1  -> Report xterm window state.  If the xterm window
//     is open (non-iconified), it returns CSI 1 t .  If the xterm
//     window is iconified, it returns CSI 2 t .
//     Ps = 1 3  -> Report xterm window position.  Result is CSI 3
//     ; x ; y t
//     Ps = 1 4  -> Report xterm window in pixels.  Result is CSI
//     4  ;  height ;  width t
//     Ps = 1 8  -> Report the size of the text area in characters.
//     Result is CSI  8  ;  height ;  width t
//     Ps = 1 9  -> Report the size of the screen in characters.
//     Result is CSI  9  ;  height ;  width t
//     Ps = 2 0  -> Report xterm window's icon label.  Result is
//     OSC  L  label ST
//     Ps = 2 1  -> Report xterm window's title.  Result is OSC  l
//     label ST
//     Ps = 2 2  ;  0  -> Save xterm icon and window title on
//     stack.
//     Ps = 2 2  ;  1  -> Save xterm icon title on stack.
//     Ps = 2 2  ;  2  -> Save xterm window title on stack.
//     Ps = 2 3  ;  0  -> Restore xterm icon and window title from
//     stack.
//     Ps = 2 3  ;  1  -> Restore xterm icon title from stack.
//     Ps = 2 3  ;  2  -> Restore xterm window title from stack.
//     Ps >= 2 4  -> Resize to Ps lines (DECSLPP).
    Terminal.prototype.manipulateWindow = function(params) {
        ;
    };

// CSI Pt; Pl; Pb; Pr; Ps$ t
//   Reverse Attributes in Rectangular Area (DECRARA), VT400 and
//   up.
//     Pt; Pl; Pb; Pr denotes the rectangle.
//     Ps denotes the attributes to reverse, i.e.,  1, 4, 5, 7.
// NOTE: xterm doesn't enable this code by default.
    Terminal.prototype.reverseAttrInRectangle = function(params) {
        ;
    };

// CSI > Ps; Ps t
//   Set one or more features of the title modes.  Each parameter
//   enables a single feature.
//     Ps = 0  -> Set window/icon labels using hexadecimal.
//     Ps = 1  -> Query window/icon labels using hexadecimal.
//     Ps = 2  -> Set window/icon labels using UTF-8.
//     Ps = 3  -> Query window/icon labels using UTF-8.  (See dis-
//     cussion of "Title Modes")
    Terminal.prototype.setTitleModeFeature = function(params) {
        ;
    };

// CSI Ps SP t
//   Set warning-bell volume (DECSWBV, VT520).
//     Ps = 0  or 1  -> off.
//     Ps = 2 , 3  or 4  -> low.
//     Ps = 5 , 6 , 7 , or 8  -> high.
    Terminal.prototype.setWarningBellVolume = function(params) {
        ;
    };

// CSI Ps SP u
//   Set margin-bell volume (DECSMBV, VT520).
//     Ps = 1  -> off.
//     Ps = 2 , 3  or 4  -> low.
//     Ps = 0 , 5 , 6 , 7 , or 8  -> high.
    Terminal.prototype.setMarginBellVolume = function(params) {
        ;
    };

// CSI Pt; Pl; Pb; Pr; Pp; Pt; Pl; Pp$ v
//   Copy Rectangular Area (DECCRA, VT400 and up).
//     Pt; Pl; Pb; Pr denotes the rectangle.
//     Pp denotes the source page.
//     Pt; Pl denotes the target location.
//     Pp denotes the target page.
// NOTE: xterm doesn't enable this code by default.
    Terminal.prototype.copyRectangle = function(params) {
        ;
    };

// CSI Pt ; Pl ; Pb ; Pr ' w
//   Enable Filter Rectangle (DECEFR), VT420 and up.
//   Parameters are [top;left;bottom;right].
//   Defines the coordinates of a filter rectangle and activates
//   it.  Anytime the locator is detected outside of the filter
//   rectangle, an outside rectangle event is generated and the
//   rectangle is disabled.  Filter rectangles are always treated
//   as "one-shot" events.  Any parameters that are omitted default
//   to the current locator position.  If all parameters are omit-
//   ted, any locator motion will be reported.  DECELR always can-
//   cels any prevous rectangle definition.
    Terminal.prototype.enableFilterRectangle = function(params) {
        ;
    };

// CSI Ps x  Request Terminal Parameters (DECREQTPARM).
//   if Ps is a "0" (default) or "1", and xterm is emulating VT100,
//   the control sequence elicits a response of the same form whose
//   parameters describe the terminal:
//     Ps -> the given Ps incremented by 2.
//     Pn = 1  <- no parity.
//     Pn = 1  <- eight bits.
//     Pn = 1  <- 2  8  transmit 38.4k baud.
//     Pn = 1  <- 2  8  receive 38.4k baud.
//     Pn = 1  <- clock multiplier.
//     Pn = 0  <- STP flags.
    Terminal.prototype.requestParameters = function(params) {
        ;
    };

// CSI Ps x  Select Attribute Change Extent (DECSACE).
//     Ps = 0  -> from start to end position, wrapped.
//     Ps = 1  -> from start to end position, wrapped.
//     Ps = 2  -> rectangle (exact).
    Terminal.prototype.selectChangeExtent = function(params) {
        ;
    };

// CSI Pc; Pt; Pl; Pb; Pr$ x
//   Fill Rectangular Area (DECFRA), VT420 and up.
//     Pc is the character to use.
//     Pt; Pl; Pb; Pr denotes the rectangle.
// NOTE: xterm doesn't enable this code by default.
    Terminal.prototype.fillRectangle = function(params) {
        var ch = params[0]
            , t = params[1]
            , l = params[2]
            , b = params[3]
            , r = params[4];

        var line
            , i;

        for (; t < b + 1; t++) {
            line = this.lines[this.ybase + t];
            for (i = l; i < r; i++) {
                line[i] = [line[i][0], String.fromCharCode(ch)];
            }
        }

        // this.maxRange();
        this.updateRange(params[1]);
        this.updateRange(params[3]);
    };

// CSI Ps ; Pu ' z
//   Enable Locator Reporting (DECELR).
//   Valid values for the first parameter:
//     Ps = 0  -> Locator disabled (default).
//     Ps = 1  -> Locator enabled.
//     Ps = 2  -> Locator enabled for one report, then disabled.
//   The second parameter specifies the coordinate unit for locator
//   reports.
//   Valid values for the second parameter:
//     Pu = 0  <- or omitted -> default to character cells.
//     Pu = 1  <- device physical pixels.
//     Pu = 2  <- character cells.
    Terminal.prototype.enableLocatorReporting = function(params) {
        var val = params[0] > 0;
        //this.mouseEvents = val;
        //this.decLocator = val;
    };

// CSI Pt; Pl; Pb; Pr$ z
//   Erase Rectangular Area (DECERA), VT400 and up.
//     Pt; Pl; Pb; Pr denotes the rectangle.
// NOTE: xterm doesn't enable this code by default.
    Terminal.prototype.eraseRectangle = function(params) {
        var t = params[0]
            , l = params[1]
            , b = params[2]
            , r = params[3];

        var line
            , i
            , ch;

        ch = [this.eraseAttr(), ' ']; // xterm?

        for (; t < b + 1; t++) {
            line = this.lines[this.ybase + t];
            for (i = l; i < r; i++) {
                line[i] = ch;
            }
        }

        // this.maxRange();
        this.updateRange(params[0]);
        this.updateRange(params[2]);
    };

// CSI Pm ' {
//   Select Locator Events (DECSLE).
//   Valid values for the first (and any additional parameters)
//   are:
//     Ps = 0  -> only respond to explicit host requests (DECRQLP).
//                (This is default).  It also cancels any filter
//   rectangle.
//     Ps = 1  -> report button down transitions.
//     Ps = 2  -> do not report button down transitions.
//     Ps = 3  -> report button up transitions.
//     Ps = 4  -> do not report button up transitions.
    Terminal.prototype.setLocatorEvents = function(params) {
        ;
    };

// CSI Pt; Pl; Pb; Pr$ {
//   Selective Erase Rectangular Area (DECSERA), VT400 and up.
//     Pt; Pl; Pb; Pr denotes the rectangle.
    Terminal.prototype.selectiveEraseRectangle = function(params) {
        ;
    };

// CSI Ps ' |
//   Request Locator Position (DECRQLP).
//   Valid values for the parameter are:
//     Ps = 0 , 1 or omitted -> transmit a single DECLRP locator
//     report.

//   If Locator Reporting has been enabled by a DECELR, xterm will
//   respond with a DECLRP Locator Report.  This report is also
//   generated on button up and down events if they have been
//   enabled with a DECSLE, or when the locator is detected outside
//   of a filter rectangle, if filter rectangles have been enabled
//   with a DECEFR.

//     -> CSI Pe ; Pb ; Pr ; Pc ; Pp &  w

//   Parameters are [event;button;row;column;page].
//   Valid values for the event:
//     Pe = 0  -> locator unavailable - no other parameters sent.
//     Pe = 1  -> request - xterm received a DECRQLP.
//     Pe = 2  -> left button down.
//     Pe = 3  -> left button up.
//     Pe = 4  -> middle button down.
//     Pe = 5  -> middle button up.
//     Pe = 6  -> right button down.
//     Pe = 7  -> right button up.
//     Pe = 8  -> M4 button down.
//     Pe = 9  -> M4 button up.
//     Pe = 1 0  -> locator outside filter rectangle.
//   ``button'' parameter is a bitmask indicating which buttons are
//     pressed:
//     Pb = 0  <- no buttons down.
//     Pb & 1  <- right button down.
//     Pb & 2  <- middle button down.
//     Pb & 4  <- left button down.
//     Pb & 8  <- M4 button down.
//   ``row'' and ``column'' parameters are the coordinates of the
//     locator position in the xterm window, encoded as ASCII deci-
//     mal.
//   The ``page'' parameter is not used by xterm, and will be omit-
//   ted.
    Terminal.prototype.requestLocatorPosition = function(params) {
        ;
    };

// CSI P m SP }
// Insert P s Column(s) (default = 1) (DECIC), VT420 and up.
// NOTE: xterm doesn't enable this code by default.
    Terminal.prototype.insertColumns = function() {
        var param = params[0]
            , l = this.ybase + this.rows
            , ch = [this.eraseAttr(), ' '] // xterm?
            , i;

        while (param--) {
            for (i = this.ybase; i < l; i++) {
                this.lines[i].splice(this.x + 1, 0, ch);
                this.lines[i].pop();
            }
        }

        this.maxRange();
    };

// CSI P m SP ~
// Delete P s Column(s) (default = 1) (DECDC), VT420 and up
// NOTE: xterm doesn't enable this code by default.
    Terminal.prototype.deleteColumns = function() {
        var param = params[0]
            , l = this.ybase + this.rows
            , ch = [this.eraseAttr(), ' '] // xterm?
            , i;

        while (param--) {
            for (i = this.ybase; i < l; i++) {
                this.lines[i].splice(this.x, 1);
                this.lines[i].push(ch);
            }
        }

        this.maxRange();
    };

    /**
     * Prefix/Select/Visual/Search Modes
     */

    Terminal.prototype.enterPrefix = function() {
        this.prefixMode = true;
    };

    Terminal.prototype.leavePrefix = function() {
        this.prefixMode = false;
    };

    Terminal.prototype.enterSelect = function() {
        this._real = {
            x: this.x,
            y: this.y,
            ydisp: this.ydisp,
            ybase: this.ybase,
            cursorHidden: this.cursorHidden,
            lines: this.copyBuffer(this.lines),
            write: this.write
        };
        this.write = function() {};
        this.selectMode = true;
        this.visualMode = false;
        this.cursorHidden = false;
        this.refresh(this.y, this.y);
    };

    Terminal.prototype.leaveSelect = function() {
        this.x = this._real.x;
        this.y = this._real.y;
        this.ydisp = this._real.ydisp;
        this.ybase = this._real.ybase;
        this.cursorHidden = this._real.cursorHidden;
        this.lines = this._real.lines;
        this.write = this._real.write;
        delete this._real;
        this.selectMode = false;
        this.visualMode = false;
        this.refresh(0, this.rows - 1);
    };

    Terminal.prototype.enterVisual = function() {
        this._real.preVisual = this.copyBuffer(this.lines);
        this.selectText(this.x, this.x, this.ydisp + this.y, this.ydisp + this.y);
        this.visualMode = true;
    };

    Terminal.prototype.leaveVisual = function() {
        this.lines = this._real.preVisual;
        delete this._real.preVisual;
        delete this._selected;
        this.visualMode = false;
        this.refresh(0, this.rows - 1);
    };

    Terminal.prototype.enterSearch = function(down) {
        this.entry = '';
        this.searchMode = true;
        this.searchDown = down;
        this._real.preSearch = this.copyBuffer(this.lines);
        this._real.preSearchX = this.x;
        this._real.preSearchY = this.y;

        var bottom = this.ydisp + this.rows - 1;
        for (var i = 0; i < this.entryPrefix.length; i++) {
            //this.lines[bottom][i][0] = (this.defAttr & ~0x1ff) | 4;
            //this.lines[bottom][i][1] = this.entryPrefix[i];
            this.lines[bottom][i] = [
                    (this.defAttr & ~0x1ff) | 4,
                this.entryPrefix[i]
            ];
        }

        this.y = this.rows - 1;
        this.x = this.entryPrefix.length;

        this.refresh(this.rows - 1, this.rows - 1);
    };

    Terminal.prototype.leaveSearch = function() {
        this.searchMode = false;

        if (this._real.preSearch) {
            this.lines = this._real.preSearch;
            this.x = this._real.preSearchX;
            this.y = this._real.preSearchY;
            delete this._real.preSearch;
            delete this._real.preSearchX;
            delete this._real.preSearchY;
        }

        this.refresh(this.rows - 1, this.rows - 1);
    };

    Terminal.prototype.copyBuffer = function(lines) {
        var lines = lines || this.lines
            , out = [];

        for (var y = 0; y < lines.length; y++) {
            out[y] = [];
            for (var x = 0; x < lines[y].length; x++) {
                out[y][x] = [lines[y][x][0], lines[y][x][1]];
            }
        }

        return out;
    };

    Terminal.prototype.getCopyTextarea = function(text) {
        var textarea = this._copyTextarea;


        if (!textarea) {
            textarea = document.createElement('textarea');
            textarea.style.position = 'absolute';
            textarea.style.left = '-32000px';
            textarea.style.top = '-32000px';
            textarea.style.width = '0px';
            textarea.style.height = '0px';
            textarea.style.opacity = '0';
            textarea.style.backgroundColor = 'transparent';
            textarea.style.borderStyle = 'none';
            textarea.style.outlineStyle = 'none';

            document.getElementsByTagName('body')[0].appendChild(textarea);

            this._copyTextarea = textarea;
        }

        return textarea;
    };

// NOTE: Only works for primary selection on X11.
// Non-X11 users should use Ctrl-C instead.
    Terminal.prototype.copyText = function(text) {
        var self = this
            , textarea = this.getCopyTextarea();

        this.emit('copy', text);

        textarea.focus();
        textarea.textContent = text;
        textarea.value = text;
        textarea.setSelectionRange(0, text.length);

        setTimeout(function() {
            self.element.focus();
            self.focus();
        }, 1);
    };

    Terminal.prototype.selectText = function(x1, x2, y1, y2) {
        var ox1
            , ox2
            , oy1
            , oy2
            , tmp
            , x
            , y
            , xl
            , attr;

        if (this._selected) {
            ox1 = this._selected.x1;
            ox2 = this._selected.x2;
            oy1 = this._selected.y1;
            oy2 = this._selected.y2;

            if (oy2 < oy1) {
                tmp = ox2;
                ox2 = ox1;
                ox1 = tmp;
                tmp = oy2;
                oy2 = oy1;
                oy1 = tmp;
            }

            if (ox2 < ox1 && oy1 === oy2) {
                tmp = ox2;
                ox2 = ox1;
                ox1 = tmp;
            }

            for (y = oy1; y <= oy2; y++) {
                x = 0;
                xl = this.cols - 1;
                if (y === oy1) {
                    x = ox1;
                }
                if (y === oy2) {
                    xl = ox2;
                }
                for (; x <= xl; x++) {
                    if (this.lines[y][x].old != null) {
                        //this.lines[y][x][0] = this.lines[y][x].old;
                        //delete this.lines[y][x].old;
                        attr = this.lines[y][x].old;
                        delete this.lines[y][x].old;
                        this.lines[y][x] = [attr, this.lines[y][x][1]];
                    }
                }
            }

            y1 = this._selected.y1;
            x1 = this._selected.x1;
        }

        y1 = Math.max(y1, 0);
        y1 = Math.min(y1, this.ydisp + this.rows - 1);

        y2 = Math.max(y2, 0);
        y2 = Math.min(y2, this.ydisp + this.rows - 1);

        this._selected = { x1: x1, x2: x2, y1: y1, y2: y2 };

        if (y2 < y1) {
            tmp = x2;
            x2 = x1;
            x1 = tmp;
            tmp = y2;
            y2 = y1;
            y1 = tmp;
        }

        if (x2 < x1 && y1 === y2) {
            tmp = x2;
            x2 = x1;
            x1 = tmp;
        }

        for (y = y1; y <= y2; y++) {
            x = 0;
            xl = this.cols - 1;
            if (y === y1) {
                x = x1;
            }
            if (y === y2) {
                xl = x2;
            }
            for (; x <= xl; x++) {
                //this.lines[y][x].old = this.lines[y][x][0];
                //this.lines[y][x][0] &= ~0x1ff;
                //this.lines[y][x][0] |= (0x1ff << 9) | 4;
                attr = this.lines[y][x][0];
                this.lines[y][x] = [
                        (attr & ~0x1ff) | ((0x1ff << 9) | 4),
                    this.lines[y][x][1]
                ];
                this.lines[y][x].old = attr;
            }
        }

        y1 = y1 - this.ydisp;
        y2 = y2 - this.ydisp;

        y1 = Math.max(y1, 0);
        y1 = Math.min(y1, this.rows - 1);

        y2 = Math.max(y2, 0);
        y2 = Math.min(y2, this.rows - 1);

        //this.refresh(y1, y2);
        this.refresh(0, this.rows - 1);
    };

    Terminal.prototype.grabText = function(x1, x2, y1, y2) {
        var out = ''
            , buf = ''
            , ch
            , x
            , y
            , xl
            , tmp;

        if (y2 < y1) {
            tmp = x2;
            x2 = x1;
            x1 = tmp;
            tmp = y2;
            y2 = y1;
            y1 = tmp;
        }

        if (x2 < x1 && y1 === y2) {
            tmp = x2;
            x2 = x1;
            x1 = tmp;
        }

        for (y = y1; y <= y2; y++) {
            x = 0;
            xl = this.cols - 1;
            if (y === y1) {
                x = x1;
            }
            if (y === y2) {
                xl = x2;
            }
            for (; x <= xl; x++) {
                ch = this.lines[y][x][1];
                if (ch === ' ') {
                    buf += ch;
                    continue;
                }
                if (buf) {
                    out += buf;
                    buf = '';
                }
                out += ch;
                if (isWide(ch)) x++;
            }
            buf = '';
            out += '\n';
        }

        // If we're not at the end of the
        // line, don't add a newline.
        for (x = x2, y = y2; x < this.cols; x++) {
            if (this.lines[y][x][1] !== ' ') {
                out = out.slice(0, -1);
                break;
            }
        }

        return out;
    };

    Terminal.prototype.keyPrefix = function(ev, key) {
        if (key === 'k' || key === '&') {
            this.destroy();
        } else if (key === 'p' || key === ']') {
            this.emit('request paste');
        } else if (key === 'c') {
            this.emit('request create');
        } else if (key >= '0' && key <= '9') {
            key = +key - 1;
            if (!~key) key = 9;
            this.emit('request term', key);
        } else if (key === 'n') {
            this.emit('request term next');
        } else if (key === 'P') {
            this.emit('request term previous');
        } else if (key === ':') {
            this.emit('request command mode');
        } else if (key === '[') {
            this.enterSelect();
        }
    };

    Terminal.prototype.keySelect = function(ev, key) {
        this.showCursor();

        if (this.searchMode || key === 'n' || key === 'N') {
            return this.keySearch(ev, key);
        }

        if (key === '\x04') { // ctrl-d
            var y = this.ydisp + this.y;
            if (this.ydisp === this.ybase) {
                // Mimic vim behavior
                this.y = Math.min(this.y + (this.rows - 1) / 2 | 0, this.rows - 1);
                this.refresh(0, this.rows - 1);
            } else {
                this.scrollDisp((this.rows - 1) / 2 | 0);
            }
            if (this.visualMode) {
                this.selectText(this.x, this.x, y, this.ydisp + this.y);
            }
            return;
        }

        if (key === '\x15') { // ctrl-u
            var y = this.ydisp + this.y;
            if (this.ydisp === 0) {
                // Mimic vim behavior
                this.y = Math.max(this.y - (this.rows - 1) / 2 | 0, 0);
                this.refresh(0, this.rows - 1);
            } else {
                this.scrollDisp(-(this.rows - 1) / 2 | 0);
            }
            if (this.visualMode) {
                this.selectText(this.x, this.x, y, this.ydisp + this.y);
            }
            return;
        }

        if (key === '\x06') { // ctrl-f
            var y = this.ydisp + this.y;
            this.scrollDisp(this.rows - 1);
            if (this.visualMode) {
                this.selectText(this.x, this.x, y, this.ydisp + this.y);
            }
            return;
        }

        if (key === '\x02') { // ctrl-b
            var y = this.ydisp + this.y;
            this.scrollDisp(-(this.rows - 1));
            if (this.visualMode) {
                this.selectText(this.x, this.x, y, this.ydisp + this.y);
            }
            return;
        }

        if (key === 'k' || key === '\x1b[A') {
            var y = this.ydisp + this.y;
            this.y--;
            if (this.y < 0) {
                this.y = 0;
                this.scrollDisp(-1);
            }
            if (this.visualMode) {
                this.selectText(this.x, this.x, y, this.ydisp + this.y);
            } else {
                this.refresh(this.y, this.y + 1);
            }
            return;
        }

        if (key === 'j' || key === '\x1b[B') {
            var y = this.ydisp + this.y;
            this.y++;
            if (this.y >= this.rows) {
                this.y = this.rows - 1;
                this.scrollDisp(1);
            }
            if (this.visualMode) {
                this.selectText(this.x, this.x, y, this.ydisp + this.y);
            } else {
                this.refresh(this.y - 1, this.y);
            }
            return;
        }

        if (key === 'h' || key === '\x1b[D') {
            var x = this.x;
            this.x--;
            if (this.x < 0) {
                this.x = 0;
            }
            if (this.visualMode) {
                this.selectText(x, this.x, this.ydisp + this.y, this.ydisp + this.y);
            } else {
                this.refresh(this.y, this.y);
            }
            return;
        }

        if (key === 'l' || key === '\x1b[C') {
            var x = this.x;
            this.x++;
            if (this.x >= this.cols) {
                this.x = this.cols - 1;
            }
            if (this.visualMode) {
                this.selectText(x, this.x, this.ydisp + this.y, this.ydisp + this.y);
            } else {
                this.refresh(this.y, this.y);
            }
            return;
        }

        if (key === 'v' || key === ' ') {
            if (!this.visualMode) {
                this.enterVisual();
            } else {
                this.leaveVisual();
            }
            return;
        }

        if (key === 'y') {
            if (this.visualMode) {
                var text = this.grabText(
                    this._selected.x1, this._selected.x2,
                    this._selected.y1, this._selected.y2);
                this.copyText(text);
                this.leaveVisual();
                // this.leaveSelect();
            }
            return;
        }

        if (key === 'q' || key === '\x1b') {
            if (this.visualMode) {
                this.leaveVisual();
            } else {
                this.leaveSelect();
            }
            return;
        }

        if (key === 'w' || key === 'W') {
            var ox = this.x;
            var oy = this.y;
            var oyd = this.ydisp;

            var x = this.x;
            var y = this.y;
            var yb = this.ydisp;
            var saw_space = false;

            for (;;) {
                var line = this.lines[yb + y];
                while (x < this.cols) {
                    if (line[x][1] <= ' ') {
                        saw_space = true;
                    } else if (saw_space) {
                        break;
                    }
                    x++;
                }
                if (x >= this.cols) x = this.cols - 1;
                if (x === this.cols - 1 && line[x][1] <= ' ') {
                    x = 0;
                    if (++y >= this.rows) {
                        y--;
                        if (++yb > this.ybase) {
                            yb = this.ybase;
                            x = this.x;
                            break;
                        }
                    }
                    continue;
                }
                break;
            }

            this.x = x, this.y = y;
            this.scrollDisp(-this.ydisp + yb);

            if (this.visualMode) {
                this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
            }
            return;
        }

        if (key === 'b' || key === 'B') {
            var ox = this.x;
            var oy = this.y;
            var oyd = this.ydisp;

            var x = this.x;
            var y = this.y;
            var yb = this.ydisp;

            for (;;) {
                var line = this.lines[yb + y];
                var saw_space = x > 0 && line[x][1] > ' ' && line[x - 1][1] > ' ';
                while (x >= 0) {
                    if (line[x][1] <= ' ') {
                        if (saw_space && (x + 1 < this.cols && line[x + 1][1] > ' ')) {
                            x++;
                            break;
                        } else {
                            saw_space = true;
                        }
                    }
                    x--;
                }
                if (x < 0) x = 0;
                if (x === 0 && (line[x][1] <= ' ' || !saw_space)) {
                    x = this.cols - 1;
                    if (--y < 0) {
                        y++;
                        if (--yb < 0) {
                            yb++;
                            x = 0;
                            break;
                        }
                    }
                    continue;
                }
                break;
            }

            this.x = x, this.y = y;
            this.scrollDisp(-this.ydisp + yb);

            if (this.visualMode) {
                this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
            }
            return;
        }

        if (key === 'e' || key === 'E') {
            var x = this.x + 1;
            var y = this.y;
            var yb = this.ydisp;
            if (x >= this.cols) x--;

            for (;;) {
                var line = this.lines[yb + y];
                while (x < this.cols) {
                    if (line[x][1] <= ' ') {
                        x++;
                    } else {
                        break;
                    }
                }
                while (x < this.cols) {
                    if (line[x][1] <= ' ') {
                        if (x - 1 >= 0 && line[x - 1][1] > ' ') {
                            x--;
                            break;
                        }
                    }
                    x++;
                }
                if (x >= this.cols) x = this.cols - 1;
                if (x === this.cols - 1 && line[x][1] <= ' ') {
                    x = 0;
                    if (++y >= this.rows) {
                        y--;
                        if (++yb > this.ybase) {
                            yb = this.ybase;
                            break;
                        }
                    }
                    continue;
                }
                break;
            }

            this.x = x, this.y = y;
            this.scrollDisp(-this.ydisp + yb);

            if (this.visualMode) {
                this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
            }
            return;
        }

        if (key === '^' || key === '0') {
            var ox = this.x;

            if (key === '0') {
                this.x = 0;
            } else if (key === '^') {
                var line = this.lines[this.ydisp + this.y];
                var x = 0;
                while (x < this.cols) {
                    if (line[x][1] > ' ') {
                        break;
                    }
                    x++;
                }
                if (x >= this.cols) x = this.cols - 1;
                this.x = x;
            }

            if (this.visualMode) {
                this.selectText(ox, this.x, this.ydisp + this.y, this.ydisp + this.y);
            } else {
                this.refresh(this.y, this.y);
            }
            return;
        }

        if (key === '$') {
            var ox = this.x;
            var line = this.lines[this.ydisp + this.y];
            var x = this.cols - 1;
            while (x >= 0) {
                if (line[x][1] > ' ') {
                    if (this.visualMode && x < this.cols - 1) x++;
                    break;
                }
                x--;
            }
            if (x < 0) x = 0;
            this.x = x;
            if (this.visualMode) {
                this.selectText(ox, this.x, this.ydisp + this.y, this.ydisp + this.y);
            } else {
                this.refresh(this.y, this.y);
            }
            return;
        }

        if (key === 'g' || key === 'G') {
            var ox = this.x;
            var oy = this.y;
            var oyd = this.ydisp;
            if (key === 'g') {
                this.x = 0, this.y = 0;
                this.scrollDisp(-this.ydisp);
            } else if (key === 'G') {
                this.x = 0, this.y = this.rows - 1;
                this.scrollDisp(this.ybase);
            }
            if (this.visualMode) {
                this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
            }
            return;
        }

        if (key === 'H' || key === 'M' || key === 'L') {
            var ox = this.x;
            var oy = this.y;
            if (key === 'H') {
                this.x = 0, this.y = 0;
            } else if (key === 'M') {
                this.x = 0, this.y = this.rows / 2 | 0;
            } else if (key === 'L') {
                this.x = 0, this.y = this.rows - 1;
            }
            if (this.visualMode) {
                this.selectText(ox, this.x, this.ydisp + oy, this.ydisp + this.y);
            } else {
                this.refresh(oy, oy);
                this.refresh(this.y, this.y);
            }
            return;
        }

        if (key === '{' || key === '}') {
            var ox = this.x;
            var oy = this.y;
            var oyd = this.ydisp;

            var line;
            var saw_full = false;
            var found = false;
            var first_is_space = -1;
            var y = this.y + (key === '{' ? -1 : 1);
            var yb = this.ydisp;
            var i;

            if (key === '{') {
                if (y < 0) {
                    y++;
                    if (yb > 0) yb--;
                }
            } else if (key === '}') {
                if (y >= this.rows) {
                    y--;
                    if (yb < this.ybase) yb++;
                }
            }

            for (;;) {
                line = this.lines[yb + y];

                for (i = 0; i < this.cols; i++) {
                    if (line[i][1] > ' ') {
                        if (first_is_space === -1) {
                            first_is_space = 0;
                        }
                        saw_full = true;
                        break;
                    } else if (i === this.cols - 1) {
                        if (first_is_space === -1) {
                            first_is_space = 1;
                        } else if (first_is_space === 0) {
                            found = true;
                        } else if (first_is_space === 1) {
                            if (saw_full) found = true;
                        }
                        break;
                    }
                }

                if (found) break;

                if (key === '{') {
                    y--;
                    if (y < 0) {
                        y++;
                        if (yb > 0) yb--;
                        else break;
                    }
                } else if (key === '}') {
                    y++;
                    if (y >= this.rows) {
                        y--;
                        if (yb < this.ybase) yb++;
                        else break;
                    }
                }
            }

            if (!found) {
                if (key === '{') {
                    y = 0;
                    yb = 0;
                } else if (key === '}') {
                    y = this.rows - 1;
                    yb = this.ybase;
                }
            }

            this.x = 0, this.y = y;
            this.scrollDisp(-this.ydisp + yb);

            if (this.visualMode) {
                this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
            }
            return;
        }

        if (key === '/' || key === '?') {
            if (!this.visualMode) {
                this.enterSearch(key === '/');
            }
            return;
        }

        return false;
    };

    Terminal.prototype.keySearch = function(ev, key) {
        if (key === '\x1b') {
            this.leaveSearch();
            return;
        }

        if (key === '\r' || (!this.searchMode && (key === 'n' || key === 'N'))) {
            this.leaveSearch();

            var entry = this.entry;

            if (!entry) {
                this.refresh(0, this.rows - 1);
                return;
            }

            var ox = this.x;
            var oy = this.y;
            var oyd = this.ydisp;

            var line;
            var found = false;
            var wrapped = false;
            var x = this.x + 1;
            var y = this.ydisp + this.y;
            var yb, i;
            var up = key === 'N'
                ? this.searchDown
                : !this.searchDown;

            for (;;) {
                line = this.lines[y];

                while (x < this.cols) {
                    for (i = 0; i < entry.length; i++) {
                        if (x + i >= this.cols) break;
                        if (line[x + i][1] !== entry[i]) {
                            break;
                        } else if (line[x + i][1] === entry[i] && i === entry.length - 1) {
                            found = true;
                            break;
                        }
                    }
                    if (found) break;
                    x += i + 1;
                }
                if (found) break;

                x = 0;

                if (!up) {
                    y++;
                    if (y > this.ybase + this.rows - 1) {
                        if (wrapped) break;
                        // this.setMessage('Search wrapped. Continuing at TOP.');
                        wrapped = true;
                        y = 0;
                    }
                } else {
                    y--;
                    if (y < 0) {
                        if (wrapped) break;
                        // this.setMessage('Search wrapped. Continuing at BOTTOM.');
                        wrapped = true;
                        y = this.ybase + this.rows - 1;
                    }
                }
            }

            if (found) {
                if (y - this.ybase < 0) {
                    yb = y;
                    y = 0;
                    if (yb > this.ybase) {
                        y = yb - this.ybase;
                        yb = this.ybase;
                    }
                } else {
                    yb = this.ybase;
                    y -= this.ybase;
                }

                this.x = x, this.y = y;
                this.scrollDisp(-this.ydisp + yb);

                if (this.visualMode) {
                    this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
                }
                return;
            }

            // this.setMessage("No matches found.");
            this.refresh(0, this.rows - 1);

            return;
        }

        if (key === '\b' || key === '\x7f') {
            if (this.entry.length === 0) return;
            var bottom = this.ydisp + this.rows - 1;
            this.entry = this.entry.slice(0, -1);
            var i = this.entryPrefix.length + this.entry.length;
            //this.lines[bottom][i][1] = ' ';
            this.lines[bottom][i] = [
                this.lines[bottom][i][0],
                ' '
            ];
            this.x--;
            this.refresh(this.rows - 1, this.rows - 1);
            this.refresh(this.y, this.y);
            return;
        }

        if (key.length === 1 && key >= ' ' && key <= '~') {
            var bottom = this.ydisp + this.rows - 1;
            this.entry += key;
            var i = this.entryPrefix.length + this.entry.length - 1;
            //this.lines[bottom][i][0] = (this.defAttr & ~0x1ff) | 4;
            //this.lines[bottom][i][1] = key;
            this.lines[bottom][i] = [
                    (this.defAttr & ~0x1ff) | 4,
                key
            ];
            this.x++;
            this.refresh(this.rows - 1, this.rows - 1);
            this.refresh(this.y, this.y);
            return;
        }

        return false;
    };

    /**
     * Character Sets
     */

    Terminal.charsets = {};

// DEC Special Character and Line Drawing Set.
// http://vt100.net/docs/vt102-ug/table5-13.html
// A lot of curses apps use this if they see TERM=xterm.
// testing: echo -e '\e(0a\e(B'
// The xterm output sometimes seems to conflict with the
// reference above. xterm seems in line with the reference
// when running vttest however.
// The table below now uses xterm's output from vttest.
    Terminal.charsets.SCLD = { // (0
        '`': '\u25c6', // '◆'
        'a': '\u2592', // '▒'
        'b': '\u0009', // '\t'
        'c': '\u000c', // '\f'
        'd': '\u000d', // '\r'
        'e': '\u000a', // '\n'
        'f': '\u00b0', // '°'
        'g': '\u00b1', // '±'
        'h': '\u2424', // '\u2424' (NL)
        'i': '\u000b', // '\v'
        'j': '\u2518', // '┘'
        'k': '\u2510', // '┐'
        'l': '\u250c', // '┌'
        'm': '\u2514', // '└'
        'n': '\u253c', // '┼'
        'o': '\u23ba', // '⎺'
        'p': '\u23bb', // '⎻'
        'q': '\u2500', // '─'
        'r': '\u23bc', // '⎼'
        's': '\u23bd', // '⎽'
        't': '\u251c', // '├'
        'u': '\u2524', // '┤'
        'v': '\u2534', // '┴'
        'w': '\u252c', // '┬'
        'x': '\u2502', // '│'
        'y': '\u2264', // '≤'
        'z': '\u2265', // '≥'
        '{': '\u03c0', // 'π'
        '|': '\u2260', // '≠'
        '}': '\u00a3', // '£'
        '~': '\u00b7'  // '·'
    };

    Terminal.charsets.UK = null; // (A
    Terminal.charsets.US = null; // (B (USASCII)
    Terminal.charsets.Dutch = null; // (4
    Terminal.charsets.Finnish = null; // (C or (5
    Terminal.charsets.French = null; // (R
    Terminal.charsets.FrenchCanadian = null; // (Q
    Terminal.charsets.German = null; // (K
    Terminal.charsets.Italian = null; // (Y
    Terminal.charsets.NorwegianDanish = null; // (E or (6
    Terminal.charsets.Spanish = null; // (Z
    Terminal.charsets.Swedish = null; // (H or (7
    Terminal.charsets.Swiss = null; // (=
    Terminal.charsets.ISOLatin = null; // /A

    /**
     * Helpers
     */

    function on(el, type, handler, capture) {
        el.addEventListener(type, handler, capture || false);
    }

    function off(el, type, handler, capture) {
        el.removeEventListener(type, handler, capture || false);
    }

    function cancel(ev) {
        if (ev.preventDefault) ev.preventDefault();
        ev.returnValue = false;
        if (ev.stopPropagation) ev.stopPropagation();
        ev.cancelBubble = true;
        return false;
    }

    function inherits(child, parent) {
        function f() {
            this.constructor = child;
        }
        f.prototype = parent.prototype;
        child.prototype = new f;
    }

// if bold is broken, we can't
// use it in the terminal.
    function isBoldBroken(document) {
        var body = document.getElementsByTagName('body')[0];
        var el = document.createElement('span');
        el.innerHTML = 'hello world';
        body.appendChild(el);
        var w1 = el.scrollWidth;
        el.style.fontWeight = 'bold';
        var w2 = el.scrollWidth;
        body.removeChild(el);
        return w1 !== w2;
    }

    var String = this.String;
    var setTimeout = this.setTimeout;
    var setInterval = this.setInterval;

    function indexOf(obj, el) {
        var i = obj.length;
        while (i--) {
            if (obj[i] === el) return i;
        }
        return -1;
    }

    function isWide(ch) {
        if (ch <= '\uff00') return false;
        return (ch >= '\uff01' && ch <= '\uffbe')
            || (ch >= '\uffc2' && ch <= '\uffc7')
            || (ch >= '\uffca' && ch <= '\uffcf')
            || (ch >= '\uffd2' && ch <= '\uffd7')
            || (ch >= '\uffda' && ch <= '\uffdc')
            || (ch >= '\uffe0' && ch <= '\uffe6')
            || (ch >= '\uffe8' && ch <= '\uffee');
    }

    function matchColor(r1, g1, b1) {
        var hash = (r1 << 16) | (g1 << 8) | b1;

        if (matchColor._cache[hash] != null) {
            return matchColor._cache[hash];
        }

        var ldiff = Infinity
            , li = -1
            , i = 0
            , c
            , r2
            , g2
            , b2
            , diff;

        for (; i < Terminal.vcolors.length; i++) {
            c = Terminal.vcolors[i];
            r2 = c[0];
            g2 = c[1];
            b2 = c[2];

            diff = matchColor.distance(r1, g1, b1, r2, g2, b2);

            if (diff === 0) {
                li = i;
                break;
            }

            if (diff < ldiff) {
                ldiff = diff;
                li = i;
            }
        }

        return matchColor._cache[hash] = li;
    }

    matchColor._cache = {};

// http://stackoverflow.com/questions/1633828
    matchColor.distance = function(r1, g1, b1, r2, g2, b2) {
        return Math.pow(30 * (r1 - r2), 2)
            + Math.pow(59 * (g1 - g2), 2)
            + Math.pow(11 * (b1 - b2), 2);
    };

    function each(obj, iter, con) {
        if (obj.forEach) return obj.forEach(iter, con);
        for (var i = 0; i < obj.length; i++) {
            iter.call(con, obj[i], i, obj);
        }
    }

    function keys(obj) {
        if (Object.keys) return Object.keys(obj);
        var key, keys = [];
        for (key in obj) {
            if (Object.prototype.hasOwnProperty.call(obj, key)) {
                keys.push(key);
            }
        }
        return keys;
    }

    /**
     * Expose
     */

    Terminal.EventEmitter = EventEmitter;
    Terminal.inherits = inherits;
    Terminal.on = on;
    Terminal.off = off;
    Terminal.cancel = cancel;

    if (typeof module !== 'undefined') {
        module.exports = Terminal;
    } else {
        this.Terminal = Terminal;
    }

}).call(function() {
        return this || (typeof window !== 'undefined' ? window : global);
    }());
